I have a rancher 400at that i use for hunting and trail riding. I have been doing some reading on this forum and it appears that alot of you fellas suggest the hmf exhaust for the the rancher. I know that there are two of them, the utility series which i can buy the quiet core for and the eco series. Does anyone have any experience with either of the two pipes, that you can tell me about and also suggest for my type of riding? Also what type of air filter and jetting kit would you recommend?