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Borla XR-1 Multi-Core 3in Ctr-Ctr Oval 16in x 4.25in x 7.88in Rotary Engine Equipped Racing Muffler

SKU: BOR400371

Mufflers

BOR XR-1 Mufflers...

Borla XR-1 Multi-Core 3in Ctr-Ctr Oval 16in x 4.25in x 7.88in Rotary Engine Equipped Racing Muffler

SKU: BOR400371

Mufflers

BOR XR-1 Mufflers...

A$664.39
Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.
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Description

XR-1(r) Multi-Core Racing Muffler. 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 16" Long Body 21" 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 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.

Product Overview

Designed for rotary engine equipped vehicles, but can be used on other applications. Compact size is perfect for applications with limited space. Reversible design for installation flexibility. Patented Multicore design for maximum power. Recommend for high horsepower applications. T-304 Stainless steel will never rust. 100% welded construction for strength. High-temperature continuous-filament fiber (CRF) acoustic material for sounds control. There is no 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.

Product Details

Body Height (in.):4.25
Body Height:4.250 in.
Body Length (in.):16
Body Length:16.000 in.
Body Width (in.):7.88
Body Width:7.880 in.
Construction:All Welded
Description:XR-1® Stainless Multicore Racing Mufflers
Grade Type:Performance
Inlet Connection Type:Pipe
Inlet Outside Diameter:3.000 in.
Inlet Position:Center
Inlet Size (in.):3
Inlet Type:Single Center
Main Piping Diameter:3.000 in.
Material:T-304 Stainless Steel
Muffler Count:1
Off Road Use Only:No
Outlet Outside Diameter:3.000 in.
Outlet Position:Center
Outlet Size (in.):3
Outlet Type:Single Center Outlet
Overall Length (in.):21
Overall Length:21.000 in.
Part Number:bor400371
Position:N/A
Prop 65 (C, R or CR):CR
Prop 65 - Long Label:WARNING: This product in the physical form it is sold does not present a hazard. However, operations including, but not limited to welding, brazing, or thermal cutting can expose you to chemicals including Chromium, Nickel, Cobalt, Arsenic, Cadmium and Lead which are known to the State Of California to cause cancer, birth defects and other reproductive harm. For more information go towww.P65Warnings.ca.gov
Prop 65 - Short Label:Proposition 65 Warning.JPG
Prop 65 Yes/No:Yes
Shape:Oval
Tip / Outlet Finish:N/A
Title Extended:XR-1 Multi-Core 3in Center-Center 16inx4.25inx7.88in - Rotary Engine Equipped Racing Muffler Part # 400371
Title:XR-1 Multi-Core Racing Muffler 3in Center Inlet/ 3in Center Outlet 4.25in x 7.88in Oval x 16in Long Body Rotary Engine Equipped Vehicles

Application Summary

XR-1? Multi-Core Racing Muffler For Rotary Engine Equipped Vehicles - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 16" Long Body 21" Overall Length. Universal Part. Reversible Design.

Part Type

Exhaust Muffler

Data: v4.2 - Upd: 2026-10-14 02:09:54

Features

  • 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 16" Long Body 21" Overall Length
  • Can be used on wide range of vehicles
  • Compact design is perfect for applications with limited space
  • Multi-Core 4 tube internal design
  • Universal muffler. Reversible design. No BORLA(r) logo embossement.

Specifications

Product Attributes - UPC
808422003711
Product Attributes - Brand
Borla
Product Attributes - Notes
Multi core design. Features stainless steel sound absorbing material to protect against burnout.
Product Attributes - Quantity
Sold individually.
Product Attributes - Part Type
Mufflers
Product Attributes - Case Shape
Oval
Product Attributes - Reversible
No
Product Attributes - Width (in.)
7.875 in.
Product Attributes - Outlet Style
Standard, without tip
Product Attributes - Product Line
Borla XR-1 Racing Mufflers
Product Attributes - Inlet Location
Center
Product Attributes - Inlet Quantity
1
Product Attributes - Muffler Finish
Brushed
Product Attributes - Outlet Location
Center
Product Attributes - Outlet Quantity
1
Product Attributes - Thickness (in.)
4.250 in.
Product Attributes - Muffler Material
304 stainless steel
Product Attributes - Inlet Diameter (in.)
3.00 in.
Product Attributes - Overall Length (in.)
21.00 in.
Product Attributes - Internal Construction
Straight-through core
Product Attributes - Outlet Diameter (in.)
3.00 in.
Product Attributes - Case Exterior Length (in.)
16.00 in.
Product Attributes - Manufacturer's Part Number
400371

Reference Information

Brand Name/s Borla
StreetFX SKU bor400371
SFX Item ID 4224971
Supplier Item Code 4224971
Manufacturer SKU 400371
Manufacturer UPC 808422003711
Alternative References xr-1, 3in, 16in, 4.25in, 7.88in

Brochures

Compatibility

XR-1? Multi-Core Racing Muffler For Rotary Engine Equipped Vehicles - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 16" Long Body 21" Overall Length. Universal Part. Reversible Design.

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