XR-1 Raceline - Multi-Core Part # 400372

Muffler Tubing Size: 3"
Fits these Vehicles:

XR-1® Multi-Core Racing Muffler For Rotary Engine Equipped Vehicles - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 12" Long Body 17" Overall Length. Universal Part. Reversible Design.

MSRP : $293.99
Or buy from Borla (USA credit cards only):

Designed for rotary engine equipped vehicles, but can be used on other applications. Compact design 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) accoustic material for sound 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.


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" 12" X 4.25" X 7.88" 17"
Shipping Info
Boxed Weight Box Size
12 6 x 10 x 19