I am thinking about getting the hmf pipe but i will probly be keeping the stock cam for a while i was wondering if i need to get the header pipe or will it make and differnece with the stock cam. Also is the hmf the best slip on to get or do you guys know of something else thats puts out more power. I will be doing mostly trail riding and drag racing. I am going to jet it to. SO if you guys will help me out i would like to know what pipe and jet size will be the best for that type of riding. I also want everyone to be able to hear be coming for a long ways really love the noise. Oh yea i have put the 13th sprocket on and i am getting 18 inch tires to.