I just got a used 2005 WR450. The bike has a FMF Factory 4 slip on exhaust and has the popping on decel. Other than that it runs good. My question is how do I know if I already have an AIS removal kit installed? the bike was traded in at a dealer that does not carry Yamaha , so they do not know. Anyone have a before and after pic of the AIS removal kit? Thanks.