My 00 came with a PC pipe and stock silencer. I bought a FMF Fatty and Turbine Core 2 and holy crap. Way better then the PC system. I did not have to mess with the jetting or anything. It depends on the riding you do. I ride wide open desert so I like the Fatty and Turbine Core 2, if you ride woods then the Gnarly would be the best to go. I don't know what the difference is between the 2 silencers so I would call FMF on that.