I have a 2002 Scram 4x4 and just picked up a HPD Trail pipe from Craigslist for $100. I ride above 7000' elevation(7000'-13000') and do lots of log hopping and trail riding. My question(s) is can someone give me an idea where I should be on the jetting. Also I am clueless on clutches and wondering what I would need to do with the clutch. Also I have a k&n air filter on it right now but the guy with the pipe threw in a foam filter, which would be best? I really appreciate any help.