Back in 2000 I had a RC-51 with Two Brothers exhaust, a powercommander, velocity stacks and an aftermarket air filter. That thing was a wheelie machine and would "indicate" a top speed of 189 when topped out :surprise: I have just recently found and purchased a beautiful 2003 RC-51 that has a Yoshimura exhaust on it. I installed a powercommander, a set of BMC filters along with new tires and chain and sprockets. The 03 feels kind of pouchy? Any ideas? Plugs maybe? It will wheelie but not as snappy as the old one did? Thanks!