The Borla XR-1 Multi-Core Racing Muffler (400371) is engineered for rotary engine-equipped vehicles but adaptable to other high-performance applications. Its compact oval design (16" x 4.25" x 7.88") fits tight spaces, while the reversible installation enhances flexibility. Made from durable T-304 stainless steel, it ensures rust-free longevity and maximum power with Borla ’s patented Multicore technology.
Key Features:
Compact, space-saving oval muffler for rotary engines
Reversible design for versatile installation
Patented Multicore technology for optimized flow and power
T-304 stainless steel construction for corrosion resistance
High-temperature CRF acoustic material for sound control
100% welded construction for durability
Made in the USA
Ideal for high-horsepower builds, this muffler delivers race-proven performance without compromising strength or sound management. No external branding ensures a clean, professional look.
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