The ultimate power boosterImproved bottom to mid-range powerProduce the low end of a longer header and the top end of a shorter headerEffectively reduces sound output by as much as 1.5 dB Yamaha --...
The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology? both internally and externallyShorter overall length that is less susceptible to crash damage and complementary to FMF's Factory...
