SLP Loudmouth exhaust systems feature 100% stainless steel construction. SLP Loudmouth Exhaust Systems features include: Engineered and built to OEM standards to ensure proper fit, Dyno-proven to outperform competitive cat-back systems, Covered by SLP's Performance Guarantee and limited lifetime warranty, Feature Modular Design, Includes detailed instructions and all installation hardware. Some of the LOUDEST systems in the industry.
Average SLP Reviewer Rating: 4.7 out of 5 based on 80 user reviews.
Find the correct part for your specific application by using the Year, Make and Model Search below.
Review: Wasnt sure weather ta get tha lm 1 or 2 so ta stay sound ordinence safe and I have no complaints. Its loud super aggressive and deep. I have tha cats removed and 1 loudmouth II that "y's" into 3 1/2 tips and its deep. Very satisfied but im changing to the loudmouth 1 because I want stupid loud lol. But if you want a good deep agressive muscle car sound thats just loud enough tha loudmouth 2 is tha way to go!!!
Current Mods / Car Accessories: Slp cold air kit computer tune built transmission cat delete
SLP Shift Knob on 2010 Camaro SS, Review Date: 4/9/2013
Review: This is a great upgrade to the irregular shaped knob on the 2010+ Camaro. The leather is soft and installation is very easy. This knob definitely gives you a more positive feel, while also giving you a more ergonomic grip than the original. One of the best upgrades I've done on my car!
Current Mods / Car Accessories: Halltech Cold Air Intake
Borla Cat Back Exhaust
Review: very pretty muffler very good build quality on par with the like of borla and other exceptional brands better yet sounds awesome great all round muffler be ware very loud which is what i wanted, but if you dont find something quieter
Current Mods / Car Accessories: 90mm intake and tb, lt headers, off road y, slp loud mouth II
Review: Just purchased a set of Loudmouth 1 resonator's about 2 weeks ago.
Fast shipping, And they sound absolutely amazing!!!
Real Mean Agressive Tones... Custom istalled them on a Cadillac Eldorado with the northstar single exhaust with Y pipe in the rear and 10 out of 10 on the sound. The best sound i have ever heard.. You must buy! yull be shocked, music to your ear's if your looking for a real mean sound and you want Loud buy them, not as loud as you would think inside the car just pure mean agressive sound...yull havta experience it to believe it! just be easy on that pedal when you pass the law lol they are LOUD. Very Pleased!!! defintly worth it.
Current Mods / Car Accessories: Catless..pcm custom tuned.
Review: SLP 3.4 pulley and a 660k6 belt for supercharger im ASE master i bought the pulley and have had no dyno and know problems with anything and to let everyone know YOU WILL NEED THE PULLEY REMOVAL TOOL FOR THIS JOB OR A CUT OFF TOOL this company sells it as a kit so by it and don't be hardheaded. from columbus ohio,
Current Mods / Car Accessories: MSD coils/WIRES ac-41101 plugs
Review: I listened to tons of sound clips. Then decided to do it right or leave it if you really want a change to stock exhaust.It is significantly louder and I guess it turns some heads. Sounds and feels great- also the tips look awesome.
If you want that the look no further!
Current Mods / Car Accessories: 2007 Corvette Convertible Z51 3LT Stock
Review: Other then a pain trying to get the MAF sensor to slide into the neck (instruction say to heat up the airlid neck with a blow dryer), the lid really does clean up the engine bay. Car is a little more noisy when leaning into since the baffles are removed, but otherwise performance is way better. Definitely worth it.
Current Mods / Car Accessories: SLP Airlid, SLP Bellow, K&N Filter, UMI 3-Point Sub-Frame Connectors, Spohn Tunnel Brace, Spohn Strut Tower Bar.
Review: I had this product profesionally installed, and the shop estemated 6 to 8 hours three days later they were just finishing up. I am not sure if it was just the set that I got or what happened. All other SLP parts I have purchased have been awesome!!! However these rubbed on everything under the car. Also made it impossible to run the EGR no big deal, but still thats beside the fact. The kicker was when the performance shop told me all that time and there was still one bolt that they could never even get on! I will admit they looked awesome on the table and sound great but as far as fitment goes they do not receive high marks on this product. P.S. don''t try to install these at home you will hate your life
Current Mods / Car Accessories: SLP loudmouth and catted x. MSD coils, steeda cold air, throttle body and plenum, Steeda under drive pulleys, and drive train/ suspension mods
Review: I noticed a difference as soon as I hit the gas the first time, not a big difference but definitely 5-7whp and noticeably better throttle response. Install is straight forward, you definitely need to use a hair drier to get the mad back on, other than that easy hp.
Current Mods / Car Accessories: 02 camaro z28 6 speed: Slp lid, pacesetter long tubes, pacesetter cat less y pipe, Borla adjustable catback, diablosport 2 predator custom tuned, ported and polished stock throttle body
Review: this loudmouth is very loud , still debating on removing factory resonator aka mid muffler for x pipe ..think i will do it though this summer def .. everyone def looks when im rolling down the street now just right not to crazy of a sound .i will be posting a video on you tube soon ..i did not like any of the videos showing this sytem on a g8 gt so when i make it it will be from every angle . inside ,outside,startup,takeoff,burnout,ext
Current Mods / Car Accessories: massive spark plugg wires , ngk tr pluggs, afe power cold air intake, underdrive, synthetic, v-power gas only , next is custom x pipe , getting rid of resonator factory.
Review: we had to replace the y pipe due to the customer running thier car off road the OEM y pipe is nonexistant, i was almost ready to have one made to finish this job then i found this one on LM performance on a web search, i was realy not sure it would work but i was desparate,i also ordered a pair of magnaflow 49 state direct fit catalytic converts, i have to tell you these three parts saved me some hassle they are great the difference between the oem y pipe and the new one is the oem is flat and looks restrictive, the new one is round and "full open" these parts fit as good as OEM only difference is the center "exhaust" crossmember had to be taken off for clearance and it is realy not anything but a scrape guard.
Current Mods / Car Accessories: 2001 stock SLP camaro
Review: Definitely worth the price! Loud aggressive tone! This is my third vehicle with the SLP LM1's and I'm sure it won't be my last. SLP = great quality, great price, and awesome sound. LMPerformance = fast shipping, and great pricing...
Here's a quick clip of the exhaust..
Current Mods / Car Accessories: 2012 GT500, all stock with the exception of the SLP Loudmouth axle back
Review: I couldn''t be happier!!! This exhaust was exactly what I was looking for. SOUNDS GREAT!!! And easy to install.
As far as shipping goes, it only too THREE DAYS. ordered it on Friday and had it installed TUESDAY A+++++++ SHIPPING!!!
Current Mods / Car Accessories: SLP Exhaust system
Review: The pipe was a little short in the tail end but it still worked out. I might have to extended the tail of the Y pipe though.
Current Mods / Car Accessories: SLP Lid, SLP MAF, SLP Smooth Bellow, Magna Flow cat back exhaust back exhaust, Spohn adjustable strut tower brace, Spohn Tunnel brace, SLP performance Y pipe. You will find out the other mods if any want to race.
Review: My Camaro is Silver with black vinyl stripes. I purchased the flat black-out panel and I'm very glad that I did. I debated between gloss and flat but the flat perfectly matches the stripes that came on my Camaro and I love it. I installed the black-out decal today and struggled with it when I attempted to follow the provided instructions. The vinyl is hard to line up and center on the paper. I scrapped the SLP instructions and did a wet install which proved to be a lot easier! I used a spray bottle with water and 3 drops of dish soap and soaked down the area, my fingers and removed the vinyl from the sheets. From there I was able to slide the vinyl into place for perfect positioning. The SS decal came with a gloss black backplate which I did not use. I put the SS directly on the flat black-out degal. I am very pleased with the results.
Current Mods / Car Accessories: Mods I've made to my 2SS include the black out panel, SS logo's on the front and the back of the car and the gill fade out decals. I have the high wing spoiler on order.
Review: I have mixed feeling about the gill decals. I struggled a little to get them placed just right and up close it is obvious that they are decals but from a distance they look great. I'm paranoid to ever run the car through a car wash or use a pressure washer around the decals. The installation was not complicated but I did have to remove and reapply a couple of the strips several times to get the placement just right with no air bubbles. It was worth it and it looks good.
Current Mods / Car Accessories: Added the side gill decals to my 2SS
Review: The removal of the Chevy bowtie and the factory SS was a little bit challenging to complete without doing any damage to the parts. The instructions did help with the removal of the bowtie but did not include any information about the removal of the factory ss. The final result of removing all factoy emblems and mounting the SS in the center of the grill where it belongs was worth the time and the money. There are a lot of Camaros on the roads these days and doing something to set mine asside that I was able to complete myself has been very rewarding.
Current Mods / Car Accessories: Replace Chevy bowtie with blank back plate with traditional SS
Review: I had a Flowmaster 80 series on the stock tail pipes with the rectangular tips. It really sounded good, but I wanted something louder. My son suggested the LMII mounted as a single muffler and dumping it before the rear axle. Well, I was surprised at the sound!! It really sounds great on the Camaro since it is low to the ground and the sound is amplified bouncing off the pavement. I must say I do miss the look of the dual tips I had, but I'll get over it. There is a drone sound inside, but I like the aggressive sound and generally ride with the windows down and the radio turned down. A great product by SLP!!
Current Mods / Car Accessories: My car is a B4C edition. It came with quite a few extras including the LS6 intake and block. I added the SLP Air Lid a few months ago.
Review: This system sounds great. but if you have crabby neighbors who dont know a thing about cars or the appreciation of good old american muscle,Id get something a little less aggressive. This system WILL wake them up and get the cops called. If you driver your car everyday you might want something a little more quiet. The system sounds great but can get on your nerves when your in the drive thru. If your looking for that NASCAR sound this is the package to get.
Current Mods / Car Accessories: full SLP system from heads to tips.
Review: fast service. fast delivery. slightly easy installation. very satisfied. will definitely be doing future business with y'all again.
Current Mods / Car Accessories: walmart rims, kimbo slice short shifter, o'reiley's direct port nitrous system, autozone head & cam combo, costco headers, 2 hardcoremaxx facepounder 12" competition subs and amp... :)
Review: Simply put, these sound very aggressive, throaty, and loud. There is some resonance at particular RPM's, but since I have a six speed, it can easily be accomodated for. I have had these for about six weeks, and someone yells out their car window at me about once a week telling me how good this car sounds. The sound clip on here is good, but in real life they sound deeper and throatier than on the video. Nice 'burble' type sound when deaccelerating. All around great sounding pipes!!
Current Mods / Car Accessories: SLP Loudmouth, Vararam Snake Charmer
Review: Let me tell you all something. I've owned 3 Mustangs. My 2011 GT is the quietest stock than the others (04'GT, and 10' GT) Soo 3 days ago I recieved my SLP's.. which only took 2 business days to get here!! Super fast shipping!! I work at a dealership which I had them install on a lift which took less than 30 min. When they started my car up, EVERYONE circled around, and the only thing anyone said was OMG that sounds GOOD! I have gotten over 20 compliments from around my dealership in the past 2 days. Be aware they are LOUD!!! People are BLOWN away when you tell them all you have is axle-backs, they think you are bluffing. THESE ARE THE REAL DEAL FOLKS !!!! 5 stars to SLP and 5 stars for LM performance for price and quick shipping!!!
Current Mods / Car Accessories: 3.73's, and SLP loudmouths
Review: Excellent quality product. Installation would be much easier with a lift, when reinstalling the steering rack after the headers are in place. You must line up the steering shaft coupling with the rack key perfectly as you guide the rack up in its position. Don''t rush or attempt to force the rectangular key into the coupling, it just takes some trial and error with the help of an extra hand.
Current Mods / Car Accessories: SLP long tubes, cats, mids, downpipes, SLP Bobcat 455 Programmer.
Review: I installed my SLP 2011 Mustang GT Loudmouth Axle-Back Exhaust pipes in an apartment parking lot with a carjack so it took me a little longer than an hour, but not much. I installed one side and checked the difference. Couldn't even hear the stock side. After installation put it on the road. Had to idle out of the complex as to not disturb them. Got out on the freeway and hit 6th gear and the resonance in the car was so great had to go back to 5th and thought that I had overdone it. After driving in 5th for about 10 miles on my way back to the apartment I tried 6th and the computer had evidently made corrections for the different pressures and temperature etc. because now it was a sound like no other. The true heartbeat of a thoroughbred 5.0 that is running loose on the open range. I am showing a mpg increase of close to 5 mpg if I can keep my foot out of it, which is hard to do. This is with supper Unleaded 93 octane. You have to own it to appreciate it. As I said in the Title it is AAAAAUUUUSSSUUUUMMMMM! They will unleash the hidden power within
Current Mods / Car Accessories: The SLP 2011 Mustang GT Loudmouth Axle-Back Exhaust is my first Modification to my unbelievable 5.0. This needs no explanation,if you own one.
Review: After ALOT of research I decided to go with the Loudmouth 2 axle back for my 2010 V6 automatic Camaro. It sounds better than the video! LM Performance delivered in 2 days and was very helpful. Quick install. I had a Flowmaster shop put it in and they were inpressed. The SLP Loudmouth 2 is better in quality and sound. I am sooooo happy! :-)
Review: This is a nice loud muffler it sound like you mean buisness nice rummble with alot of noice
Current Mods / Car Accessories: this is a nice part i got aftermarket wires plugs intake headers exhaust and tuned. i am pushing 385hp with this set up the intake is slp the headers are slp the exhaust is a y pipe slp and the
Review: It was a little aggravating to install. I have ran other intakes and cant say that I noticed a difference in between slp's and other brands. It does sound nice. Is worth the money not by much tho.
Current Mods / Car Accessories: Slp cold air intake, Pacesetter LT headers and y-pipe, Magnaflow cat back exhaust, Spohn Torque arm
Review: I just put these on my 99 Z28 an oh my god i got in my car and cranked it over, it made that LS1 Growl! Item was shipped in about 4 days, I was very impressed. I would reccommend this site an the SLP Loudmouth II to anyone with a F-Body!!!
Current Mods / Car Accessories: 1999 Z28 Camaro 5.7 Liter LS1, mostly Stock with 3:96 gears
Review: I have to say that I am very pleased with the SLP Loudmouth exhaust! The installation was a snap... took about an hour. The sound is incredible!! This was my first mod on my Camaro and I have to say it turned this V6 from a tame kitty purr to a fierce lion roar!
The product is well made and very solid plus the tips look awesome. I would recommend this to anyone who wants to enhance the engines sound and turn a few heads along the way.
Current Mods / Car Accessories: SLP loudmouth axel back exhaust
Review: The sound is absolutely the meanest I've heard in a long time. Exceeded my expectations just as indicated by the previous review. The poor little Mustangs pulling up next to me look frightened :)
Current Mods / Car Accessories: SLP long-tube headers and SLP LM-1 exhaust on a 2000 SS camaro.
SLP powerflo-better than stock without being painful, Review Date: 9/27/2010
Review: exhaust sounds better than stock. stock is boring and silent, powerflow adds volume without giving you a head ache. not likely to get you attention from cops, but loud enough to get some looks. interior rumble at low rpms is kind of loud and can get old and it sounds ok when opened up. regular cruising speed sounds nice without being "loud". if you really want attention and like to listen to your engine scream, but still want to be able to use the car as a daily driver, go for loudmouth 2. if you want the loudest without just being too much, go for loudmouth 1. if you want your ears to bleed, get rid of the cats and keep the lm1
Current Mods / Car Accessories: powerflow axel back exhaust
Review: The sound that comes out of the Loudmouth II is awesome!! Well above the expected sound. Gives the V6 a V7 like sound that reverberates through around town cruising. Above 3000 rpm transforms the low growl to a roar and an ear to ear grin on the driver.
Current Mods / Car Accessories: This is currently the only modification
Review: I love these exhaust. It is by far the best invest i could make. There perfect. There loud enough to turn heads but when you get up to 5th gear its a nice lil rumble but not to loud to get on your nerves either. i love em.
Review: quick delivery on LM's part; got to me within 2 days. Took about 4 hours to put the catback on as I ran into issues removing the stock unit. The SLP catback is made well and fitted together good. The instructions it came with weren't the greatest, but it did its job. Overall fitment of the parts was good. I had a slight clearance issue with the pipe over the rearend, but nothing too bad. Sound is good, idle is a bit louder and deeper than stock. Under load, it is louder (cabin noise isn't much higher) and definately has more rumble and less drone than the stock exhaust. This is a great system for the price.
Current Mods / Car Accessories: slp loudmouth 2 catback
Review: Personally the install was easy, directions were simple. Fit and finish is good. I love the sound that it delivers, not so much for the wife. I warned her for over 2yrs this was going to happen. Now, she isn't so pleased. I even got a guy with a Viper RT/10 to snap his head and give the thumbs up! Noticed a gas mileage increase already, as long as you keep your foot out of the pedal! With the 4 cyl shut down, you can really hear the note change at cruising speeds, and I think it makes it easier to stay in that fuel saver mode. Thanks for the product, really enjoy it.
Current Mods / Car Accessories: No Additional Mod's at this time.
Review: I was running long tubes, O/R H pipe, and these SLP LM1 and the car was AGGRESSIVE and sounded AWESOME!!! There was nothing that sounded this mean on the street!! It was loud enough to hear me for miles!!!! Get this exhaust if you looking for mean and raw power sound!
Current Mods / Car Accessories: 2000 Mustang GT - Full bolt ons, full suspension, with nitrous.
Review: Followed the instructions and install was easy. Be careful removing the rear Bowtie as there are two pegs behind it. Also I pulled from one side and the edge of the bowtie gave me a little chip, easy fix just put something behind the oppostie side that you are pulling on when removing.
The front one looks great, like it came with the car. The rear looks good. I have dark IBM paint so the black landing pad for the rear blends in well and it does cover the holes from the bowtie. It would look better with the blackout rear, but I didnt go with that.
Current Mods / Car Accessories: SLP Skip shift eliminator
SS retro Badges
Review: Just installed the SLP Loudmouth axle back system, sounds great. Installation was a little tricky as the exsisting system had a stud that had to be ground down to allow the SLP pipe to go over the forward exhaust system. Also the SLP passenger side pipe hanger rod had to be re-bent a little in order for the pipe to run straight out the back.
The driver side went on with no problem, all in all it took about 1.5 hours - only because I had to grind off the studs on the exsisting system and bend one rod.
Current Mods / Car Accessories: Saleen Supercharger, Racecraft suspension system, 2.5 Ford Performance Exhaust System. 420 hp 400 ft lbs torque.
Review: good exhaust! excellent fit, installed in about 30 minutes in my driveway with jack stands. however it is not 304 stainless steel as advertised *(the mufflers may be) and the mufflers look amazing like a mirror. but the rest of the tubing is not 304 it is a lower grade 409.
Current Mods / Car Accessories: 99 gtp gen v 3.1, n* tb, slp headers, xp cam, 42.5# injectors
95 ford mustang Gt with flow duals, Review Date: 3/2/2010
Review: Welded it on instead of the clamps because i didnt want them to be visible. The sound is like no other and completely exceded my expectations. Highly recommend it to any one who wants to really let their f-body breath.
Review: After listening to the sample SLP video of these pipes, we were impressed and bought them after listening to them all. Installation took 30 minutes just like the instructions said and these were very simple to install. Sound is amazing. We were not let down with this product and would recommend to anyone looking for a great sound with a quick and easy install that the do it yourself guy at home can do.
Current Mods / Car Accessories: This is the first mod.
Review: The X pipe needs to be marked bottom or top. This would eliminate the guess work in installing it and aligning the rest of the exhaust system. In the instructions it says to use the two old muffler support hangers faceing outward. It should say the two faceing inward.Other than these two small details the fit is good and the sound is nice.
Current Mods / Car Accessories: K&N FIPK cold air system
Review: I ordered the LM II's before my car arrived. I love the sound from the outside and that the resonance isn't bad within the cabin. But, you do know that it's a sports car and you can hear it coming and going now. Thanks, and check out the video of my SLP Loudmouth II Axle Back Exhaust:
Current Mods / Car Accessories: No mods on my 2010 Camaro SS.
Review: Top quality workmanship! great fit! One note: to all Z71 Tahoe owners..you will need to trim a small portion of the bottom of the fender flare for chrome tip clearance. And if you have the factory accessory mud flaps it too will need to be trimmed. Gives a nice idle exhaust note..not too loud!
Review: Installation Time ~1.5hours
Noticeable low end improvement
Great sound. On deceleration there is very audible "gurgle" in the exhaust.
Gas mileage actually decreased slightly. Expect that tuning and dyno time will improve both HP and MPG further.
Current Mods / Car Accessories: K&N Cold Air Intake
Review: MY STANG SOUNDS AWESOME NOW, LIKE A V8 MUSCLE CAR SHOULD. IT SEEMS LIKE ITS THREE TIMES LOUDER THAN STOCK! ITS EASILY THE LOUDEST STANG IN MY AREA NOW, AND AMONG THE LOUDEST MUSCLE CARS PERIOD, AND I HAVENT EVEN ADDED THE LONGTUBE HEADERS AND OFF ROAD H-PIPE YET!!!
Current Mods / Car Accessories: DONT ASK, DONT TELL.
Ive had great service with LMPerformance.com in the past, and my experience of their customer service has been great. Because I dont live far from their warehouse, shipping has always been very fast. I have purchased the majority of my parts from LMPerformance.com and have never had a bad experience. To add to the value of this site, every part (available at LMPerformance.com) Ive broken on my car I was able to find here cheaper than any mechanic or local shop was able to provide. Overall, I have nothing but great things to say about LMPerformance.com and the products they provide.