Since I do not have a bike yet this may seem an odd question to ask. But here goes: I hope to soon have a C50 or perhaps an M50. So far as I know it would apply to either one as I assume they are the same thing mechanically. I have read a lot of other posts about exhaust upgrades. I recently noticed a post in here that explained the horsepower/torque ratios on the C50. I can't remember who posted it...but thank you. If I remember correctly the hp was 43. It seems common that many like to change the exhaust and gain some power and a better sound. I also assume that with fuel injection a power commander will be needed instead of a jet kit. So if this was done to a bike like this with Vance and Hines, D & G or whatever brand along with a complete kit (Thunderjet Hypercharger ?? ) what would the expected gain be? This stuff is expensive, I think around $800.00 plus. I would hope the hp gain would be significant because if most of this cost is only going to upgrade the sound system I would rather upgrade the one in my living room. I am so looking forward to getting this bike and I will do other things like a light bar and windshield first. Thank you for your help. Michael