XR-1 Raceline - Multi-Core Part # 4ALEXR1993

Muffler Tubing Size: 3"

XR-1® Multi-Core Racing Muffler (6 Core) For Full Bodied Cars - 3" Center Inlet/ 3" Center Outlet 5" x 6.25" Oval x 13.5" Long Body 18.5" Overall Length. Universal Part. Reversible Design.

Price : $324.99
Summit Racing Equipment
Or buy from Borla (USA credit cards only):
International customers contact us for shipping quote.

This muffler supersedes 4ALEX1993. Patent Pending. This muffler design was run by the entire field at the 2023 Busch Light Clash At The Coliseum race. The part number 4ALEXR1993 that is used on this muffler is a nod to our co-founder Alex, the XR1 Multi-core Muffler, and the year that the patent for the Borla Multi-Core muffler design was issued. 3" Center Inlet/ 3" Center Outlet 5" x 6.25" Oval x 13.5" Long Body 18.5" Overall Length. Designed for full bodied cars, but can be used on other applications. Reversible design for installation flexibility. Patented Multicore design (6 core) for maximum low and power. Recommend for high horsepower applications. Heavy duty 16 gauge body. T-304 Stainless steel will never rust. 100% welded construction for strength. Brushed finish for sharp appearance. Can be polished to a mirror finish. High-temperature continuous-filament fiber (CFF) acoustic material 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.


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 to

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Available for this vehicle

Technical Specs
Muffler Config Muffler Shape Muffler Tubing Size Case Dimensions Muffler Oal
Center/Center Oval 3" 13.5" X 5 X 6.25" 18.5"
Shipping Info
System Weight