Seibon
Seibon 17-20 Tesla Model 3 Carbon Fiber Rear Diffuser
* Images may be a representation and may not reflect the actual product.
Product Details
Seibon 17-20 Tesla Model 3 Carbon Fiber Rear Diffuser
sei774-T14MD3RL
Vehicle Fitment
Please verify year, make, model, and any notes before ordering.
- 2017-2020Tesla Model 3
Product Specs
- Brand
- Seibon
- Part Number
- 774-t14md3rl
- Catalog Number
- 001437256
- Product Line
- Rear Diffusers
- Category
- Exterior Styling
- Type
- Diffusers
- UPC / Barcode
- 887753490469
- Vendor Product Category
- Exterior Styling
- Vendor Product Subcategory
- Diffusers
- Length
- 75.50 in
- Width
- 31.00 in
- Height
- 12.00 in
- Weight
- 18.00 lb
- Units Per SKU
- 1
- Freight / LTL
- Yes
- Air Restricted
- No
- Prop 65
- Unknown
- CARB Approved
- Yes
- Clearance Item
- Yes
Shipping & Availability
This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.
PROP 65 WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Please inspect all truck freight items before signing for delivery. If the item is damaged or missing parts, refuse the shipment or sign the delivery receipt as damaged.
Inventory shown: 10 available as of 6/3/2026.
Items sold by Seibon International, Inc. may not be legal for street use in all states. It is the buyer’s responsibility to comply with applicable state laws. Buyer understands that due to strict U.S. Federal and State safety crash guidelines, Seibon is not responsible or liable for any damages or possible injuries incurred upon possible accidents due to driver error, incorrect installations, bad judgment, or act of nature/God, Allah, Jehovah, etc. All products are intended for off-highway uses only, and should be used for their intended purposes only. Seibon does not take responsibility over buyer installation, modification, and unusual stress of the products. The buyer assumes all responsibilities for determining the suitability of the products. Seibon is not responsible for any damages incurred either directly or indirectly on the vehicles or operators/passengers within the vehicles.
Seibon Fitment Guarantee
The following situations are fully covered under the Seibon Fitment Guarantee:
Hoods:
- Hood does not clear a stock engine
- Gap between the hood and the fenders are more than 1/2" wide on each side
- Hood levels more than 1/4" higher or lower than the fenders
- Latch is 1/16" too long or too short than the stock latch, causing the hood not to latch
- Please note that Seibon Carbon does not suggest re-installing gas hood shocks/dampers/struts.
- Seibon does not guarantee fitment on cars that have been in involved in accidents and/or had body damages.
- Seibon strongly recommends the use of heat shields. Damages to the hood that results from the absence of heat shields will not be covered under warranty.
Trunks:
- Gap between the trunk and the rear fenders are more than 1/2" wide on each side
- Trunk levels more than 1/4" higher or lower than the rear fenders.
- Please note that Seibon Carbon does not suggest re-installing gas trunk shocks/dampers/struts.
- Seibon does not guarantee fitment on cars that have been in involved in accidents and/or had body damages.
Lips:
- Length of the lip is 3/8" too long or too short than the stock bumper
Seibon Appearance Guarantee
The following situations are fully covered under the Seibon Appearance Guarantee: (Note that all Seibon carbon fiber products are hand-made, and small imperfections are inevitable. Claims guilty of abusing Seibon's claims program will be denied immediately)
Heavy cloudiness under the clear coat (which is only visible under the sun. Seibon apologizes for not being able to QC every product under natural sun light)
Clear coat bubble larger than 3/8" in diameter
Seibon Clear Coat Guarantee
The following situations are fully covered under the Seibon Clear Coat Guarantee:
Clear coat changes color more than a full shade within 6 months (Note: like car paint, slight fading and discoloration is natural. The warranty only covers more extreme cases.)
Installation
All products require professional installation. Buyer understands that some products may require modifications for correct fitment. Minor adjustments may be necessary as part of the normal installation process. All carbon fiber products will not sustain heavy force or weight, for they could be cracked by such force or weight. Seibon has made an effort to produce all its aftermarket products to fit the original factory vehicles as closely as possible. However, some occasional prepping may be necessary for an ideal fit. The buyer needs to perform these steps to his/her satisfaction before installation. If the buyer wishes to paint the products, he or she must pre-fit the parts to the vehicle before painting to ensure proper fit. There are absolutely no returns on painted products.
Hood Pins
All hoods require hood pins for safety reasons. Seibon will not be liable for any damages to the product and the vehicle caused by not properly using hood pins.
Heat Shields
Heat shields are required for all carbon fiber hoods, for the same reason that the stock factory hoods use heat shields. Carbon fiber hoods require similar protection, and heat shields can help avoid pre-mature aging and discoloration of the product.
Shipping Damage
Seibon packs all products carefully to prevent damage during shipping. However, damage may still occur occasionally. Buyer must inspect the packaging and the products carefully upon receiving them, then accept the shipment and notate any damages and irregularities, such as crushed, torn, punctured, or broken parts on both the packaging and the product, on the freight bill or receipt at the driver's presence. Buyer must retain all cartons, packing materials, and damaged products for the carrier's damage inspector to inspect. Do not refuse shipment or return it without approval, because the buyer's right to make a damage claim may be denied. A signed receipt without any notation indemnified the carrier as well as Seibon from any further damage claims. Discovery of damages after a clear delivery becomes the responsibility of the customer.
All damages must be notified to carrier and the dealer within 24 hours. In cases of damage with proper notation on receipt, the carrier will determine whether to pay for repair cost or replacement value of the damaged goods after damage inspection. Replacement value is the amount the buyer paid to the distributor and is not negotiable. All disputes about the settlement amount should be addressed with the carrier. Seibon, under no circumstances, shall be liable for the damaged product or for subsequent settlement of the claim with the carrier.
Defective Products
All products require professional installation. Minor adjustments might be necessary. These are normal body work and installation steps. Therefore it is NOT considered to be defective. In addition, most carbon fiber products are hand-crafted, and no two items will be identical. Small imperfections such as wavy weaves, small bubbles, and clear coat blemishes are inevitable. Pictures are required to demonstrate true defects on products prior to return. See below for information on our return policy.
Reviews & Questions
Real product feedback when available, plus quick ways to get fitment or product help.
Other Popular 2021 Parts
Seibon Carbon, a division of Seibon International, Inc., specializes in the design and manufacture of high-quality carbon fiber automotive body components such as hoods, trunks, fenders, and aerodynamic body additions such as rear spoilers and side skirts.
Seibon Carbon fiber hoods, carbon fiber body kits, and other components are carefully hand-crafted using only the finest materials. Seibon Carbon Fiber hoods and carbon fiber body kits offer superior craftsmanship with over 15 years of experience working with carbon fiber.
Every one of the Seibon Carbon Fiber hoods and carbon fiber body kits are constructed with a consistent weave pattern and an exceptional carbon/resin ratio, creating high product stiffness that also leads to extra strength. For a stunning finish, our products are coated with a glossy clear coat that does not chip or flake. We meticulously inspect all of our components and stand firmly behind our products so that you can enjoy peace of mind with all genuine Seibon Carbon fiber hoods and carbon fiber body kits.
Creating performance-oriented products that help shed unnecessary weight without sacrificing style is our specialty. Race after race, Seibon carbon fiber hoods and carbon fiber body kits have proven to be as strong as the driver's ambition to win, thus making Seibon Carbon the preferred brand among professional drivers. Check out our Carbon Fiber Auto Parts for more incredible performance parts.
Review our return, cancellation, shipping, warranty, and product image policies before ordering.
Contact us with questions before ordering
California Residents: Prop 65 WARNING: This product MAY contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov
California Residents: TIRE WARNING: LMPerformance will not ship Tires to California.
Legal: Some or all of these parts may not comply with Federal, State, Province, and/or Local laws, ordinances, and regulations. Buyer takes all responsibility to ensure that any modifications or upgrades that have done conform to all applicable laws and regulations for road use, especially pertaining to safety and emissions. LMPerformance is not responsible for buyer not complying with Federal, State, Province, and/or Local laws, ordinances, and regulations. This policy shall be in force for all past, current, and future purchases from LMPerformance, Inc. LMPerformance will not ship ANY non-CARB compliant products to California where California requires products to be CARB certified such as Catalytic Converters and Induction Kits.
Free Shipping: Please note FREE Shipping refers to shipping within the contiguous continental US only. All other locations extra. Some items that require Truck Freight Delivery will require a Truck Freight surcharge. This surcharge is still a discounted shipping amount that is lower then the actual truck freight shipping charge that is charged to LMP. LMP will try to still give the lowest price possible for truck freight items.
Images: Images may be a representation and may not reflect the actual product. Examples would be SPEC stage 3 clutch kits which all use the same photo.
TYPOS: LMPerformance tries to present the best most accurate information on our website. Sometimes we get mistakes in product information sent from vendors such as typos. We can not be responsible for these typos, if you see something that does not look right please let us know before ordering so we can double check for you first. LMPerformance will not pay for typos in any way, monetarily or otherwise.
Price Errors: In the event that a product has mistakenly been listed at an incorrect price, We reserve the right to refuse or cancel any orders placed for product listed at the incorrect price. We reserve the right to refuse or cancel any such orders whether or not the order has been confirmed and your account charged. If your payment type has already been charged for the purchase and your order is cancelled, a full refund to your orignial payment method in the amount of the incorrect price will be issued.
Special Order ITEMS: Some items are Special Ordered and may not be returnable, or even cancellable as they are going into production specifically because you ordered them. Special Ordered items can have a 5-35% cancelation fee.
Cancellations: Instock orders cannot be canceled due to our automated ordering & fast shipping system. To keep our prices low, all cancelations are subject to a 5% cancelation fee to cover transaction processing fees. We reserve the right to charge up to a 10% cancellation fee for cancelled orders due to merchant fees, Special Order fees and the cost of processing and shipping orders.When you request a cancellation of an order or a part, please note that it may take time for a manufacturer to cancel an order if the order is drop-shipped. We also have to confirm that the product has not shipped. If the product has shipped then this must be processed as a return.Also note that sometimes products ship more quickly than expected, so we recommend that you do not purchase alternative products until receiving final confirmation of the cancellation.
Returns: We cannot accept returns on parts that have been used or installed. No returns will be accepted after 30 days. All Returns must be in original packaging. Prior authorization must be given before any return can be made. Up to a 25% Restocking Fee may apply. Special Orders may be subject to Additional Manufacturer Restock Fees as well. Shipping cost will not be refunded.Hoods as well as PCM Programmers may not be returned unless defective and only for replacement. ALL returns must be first filed using our online form found here: https://www.lmperformance.com/returns.
Lost Order Claims All lost order/package claims must be made within 5 days of the shipping date or tracking information delivery date. All claimes made after this date will not be accepted due to Shipping companies policies of filing loss claims.
Damaged Items or Incorrect Items: Please contact us right away if your item has been damaged in shipping or are incorrect. Please note that we will ship replacement items the same method of shipping the order was originally placed for. LMPerformance can not ship packages overnight at our cost if the original shipping was not also overnight. Claims must be filed in order for replacement parts to be shipped.
Warranties:Any warranty claims must be placed with the manufacturer. All of the products sold by LMPerformance, regardless of the manufacturer, are designed for Racing and Performance applications. Many of our manufacturers offer NO WARRANTY on their products, either stated or implied, due to the unusual stresses placed on the parts and because we have no control over how they are installed and used. Many of these products are designed for off-road use only and are not legal for use on public highways. If you have a question about the warranty on a specific product, please e-mail or call us. Buyer assumes all risk and liability associated with these products.
Installation: We are not responsible for or any costs associated with the installation or the improper installation of any products. Purchaser assumes the risk associated with the installation of products. We, along with the manufacturer of each product are not responsible for any direct or indirect damage to the vehicle, personal, or costs incurred from the use of products.