DynoMax Race Bullet mufflers feature 100% welded construction for lifelong durability. The "Pure Unadulterated POWER" and lightweight, compact design make it the ultimate race muffler. The unrestricted, straight-through design is dyno tested and track proven. Each muffler uses DynoMax exclusive Continuous Roving Fiberglass (CRF) Technology which helps provide up to a 4 dbA sound reduction, on most race applications, while maintaining a deep race tone.