Borla XR-1 Multi-Core 3in Center/Center 16in x 4.25in x 7.88in Oval Racing Muffler

SKU: BOR40575

Mufflers

BOR XR-1 Mufflers...

Borla

Borla XR-1 Multi-Core 3in Center/Center 16in x 4.25in x 7.88in Oval Racing Muffler

SKU: BOR40575

Mufflers

BOR XR-1 Mufflers...

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 16" Body 21" Overall Length. Compact size is perfect for applications with limited space but can be used on a wide range of vehicles including rotary engine equipped vehicles. It features BORLA(r)'S patented Multi-Core 3 tube design for maximum flow, horsepower and torque. The Multi-Core portion of XR-1(r) mufflers flows better than straight tubing. 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 T-304 stainless steel wool packing for sound control. 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

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.

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-1Ã‚Â® 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:	bor40575
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 - Racing Muffler Part # 40575
Title:	XR-1 Multi-Core Racing Muffler 3in Center Inlet/ 3in Center Outlet 4.25in x 7.88in Oval x 16in Long Body

Additional Information

This part is designed and intended for installation in Ancient (Model Year 1974 or earlier), or Competition, or Racing Vehicles. Competition or Racing Vehicles may be operated exclusively in 1) events organized by recognized bodies with authorizing permits for participating drivers. 2) racing event qualification, and 3) practice associated with events. Installation and operation of this part in a non-Ancient street driven Vehicle, including driving Competition or Racing Vehicles to the racetrack, is likely to be considered illegal Tampering or a Defeat Device

Application Summary

XR-1? Multi-Core Racing Muffler For Full Bodied Cars - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval 16" Body 21" Overall Length. Universal Part. Reversible Design.

Part Type

Exhaust Muffler

Data: v4.2 - Upd: 2026-10-14 02:09:53

Features

3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval 16" Body 21" Overall Length
Can be used on a wide range of vehicles including rotary engine equipped vehicles
Compact design is perfect for applications with limited space
Multi-Core 3 internal tube design. High temperature T-304 stainless steel wool for sound control.
Universal muffler. Reversible Design.

Specifications

Product Attributes - Brand: Borla
Product Attributes - Manufacturer's Part Number: 40575
Product Attributes - Part Type: Mufflers
Product Attributes - Product Line: Borla XR-1 Racing Mufflers
Product Attributes - UPC: 808422405751
Product Attributes - Muffler Material: 304 stainless steel
Product Attributes - Inlet Diameter (in.): 3.00 in.
Product Attributes - Outlet Diameter (in.): 3.00 in.
Product Attributes - Inlet Quantity: 1
Product Attributes - Outlet Quantity: 1
Product Attributes - Inlet Location: Center
Product Attributes - Outlet Location: Center
Product Attributes - Case Shape: Oval
Product Attributes - Reversible: No
Product Attributes - Internal Construction: Straight-through core
Product Attributes - Muffler Finish: Natural
Product Attributes - Case Exterior Length (in.): 16.00 in.
Product Attributes - Overall Length (in.): 22.00 in.
Product Attributes - Thickness (in.): 4.250 in.
Product Attributes - Width (in.): 7.875 in.
Product Attributes - Outlet Style: Standard, without tip
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: Multi core design. Features stainless steel sound absorbing material to protect against burnout.

Reference Information

Brand Name/s	Borla
StreetFX SKU	bor40575
SFX Item ID	4225564
Supplier Item Code	4225564
Manufacturer SKU	40575
Manufacturer UPC	808422405751
Alternative References	xr-1, 3in, 16in, 4.25in, 7.88in

Brochures

Primary brochure

Compatibility

XR-1? Multi-Core Racing Muffler For Full Bodied Cars - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval 16" Body 21" Overall Length. Universal Part. Reversible Design.

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