their are a few questions i have to ask but first off i bought a raptor 660 used from what the guy a bought it from told me it has a 686 big bore or bigger "said it was bored over 10" and hotcams idk what stage and hot rods wasnt to smart on quads when i bought it i got shafted bad but iv pretty mutch got everything fixed and was looking to put a hmf comp series exhaust on it a pro flow filter so i can run without lid and a dynojet kit now my questions are what dynojet kit do i need stage 1 or 2? and do i need a 25 pilot i live in TN about 900ft above sea level can someone explain what dynojet kit i would need for those mods and if i need to upgrade a pilot or if i need to upgrade anything else to have these mods thank you for your time