I disagree. I tune with A/F Meters, I have the Muzzy's WEGO III graphing AF Meter and the NGK from Hunterworks and on both my 08 and 09 there was black residue on the muffler outlets. I just removed my exhaust and I am working on installing the PRO system on my 09 but I will try to take a photo of what came off my 09 and the outlets have black residue on them and the machine is tuned well and runs KILLER, ask rustybas who I ride with how it runs.
2011 Teryx Sport
2011 50" STD RZR LE
Last edited by Magellan; 01-18-2010 at 04:39 PM.