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Borla

Borla Non-Spec Vehicle ALL XR-1 Stainless Multicore Racing Mufflers

MPN: 400372 Catalog #: 00828538 Category: Muffler Check Vehicle Fitment

Product Details

XR-1(r) Multi-Core Racing Muffler. 3 Center Inlet/ 3 Center Outlet 4.25 x 7.88 Oval x 12 Long Body 17 Overall Length. Compact size is perfect for applications with limited space and can be used on a wide range of vehicles. It features BORLA(r)'S patented Multi-Core 4 tube design for maximum flow, horsepower, and torque. The Multi-Core portion of XR-1(r) mufflers flows better than straight tubing. Recommend for high horsepower applications. Reversible design for installation flexibility. T-304 Stainless steel for superior corrosion resistance. Natural mill finish can be brushed or polished prior to installation. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sound control. There is no BORLA(r) logo embossment on this part. Best of all, it's made in the USA. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.

BORLA 400372: XR-1 Stainless Multicore Racing Mufflers; Center/Center; Rotary Engine Equipped Vehicles; Oval; 3 in. Inlet/Outlet; 12 in. x 4.25 in. x 7.88 in. Case Size; 19 in. Overall L;

BORLA XR-1 Raceline products are the choice of todays hottest drag and oval track racers. Featuring a patented uninerrupted-flow design and multicore technology. BORLAs XR-1 mufflers actually outflow a straight piece of pipe in repeated testing. XR-1 race products are light weight and constructed of high quality austenitic stainless steel for track-tough durability. They meet the strictest noice requirements and use sound absorbing stainless steel pcking to protect against burnout. Hands down, BORLAs XR-1 Raceline offers the best balance of sound and power.

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Product Specs

Brand
Borla
Part Number
400372
Catalog Number
00828538
Product Line
XR-1
Category
Exhaust
Type
Muffler
UPC / Barcode
808422003728
Vendor Product Category
Exhaust, Mufflers & Tips
Vendor Product Subcategory
Muffler
Box Length
19.90 in
Box Width
9.90 in
Box Height
4.70 in
Ship Weight
9.80 lb
Units Per SKU
1
Freight / LTL
No
Air Restricted
No
Prop 65
Y
CARB Approved
Yes
Clearance Item
No

Shipping & Availability

Current status 4 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available distributor 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.

Inventory shown: 7 available as of 7/22/2026.

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