250/350/450SX-F TI F4.1 RCT SO TI/CF-TIP

The Factory 4.1 RCT incorporates FMF's Resonance Chamber Technology™ both internally and externally RTS (Rapid Tuning System) Huge weight savings In addition, FMF achieves a shorter overall length that is less susceptible to crash damage and complementary to their Factory Forward Engineering - moving the muffler closer to the motor to centralize mass Massive Power gains throughout the RPM range. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet their exacting specifications and is manufactured 100% at their Southern California factory