I have an 04 450R I just got the HRC kit installed and My HMF full system will be here next week. My question is if i spend the $50 on a filter am i gonan notice anything?? Will it require a rejet? Just curious because i want to make it as fast as i can with just boltons. She sure rips now I cant wait to try out the exhaust! Anyone else having a problem with obliterating the stock rear tires everytime you nail it. This thing will break free in third, and while shifting to fourth on loose stuff.