The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology� both internally and externally. -FMF uses the highest quality proprietary blend of alloy grade titanium made specifically to our standards.
I replaced my stock pipe with the FMF and all it did was make it sound wimpy and took away lots of back pressure that the stock pipe supplied. I entered a race without testing and was blowing through corners and was annoyed with the tone that the pipe was giving my motor. It looks bad ass but i will be selling a brand new pipe with one ride if your interested let me know