I want more power out of my 06 ltz 400 right now it is completly stock, I need more power in the sand like at glamis. I dont have much money but I want to do this right, I was thinking of a slip on exhaust like motorworks or hmf, but would it be worth it to get a head pipe like the fmf power bomb?? I also plan on jetting and something like k&n filter with air box mods. I really want the most bang for the buck so Im a little gun shy with the prices of these exhaust systems. I also need something that isnt too loud for park riding. thanks for any help.