I have no porting, +4 timing, and carbon fiber reeds on stock cages.I'm about 400 ft above sea level and was jetted at 320 mains and 27.5 pilots with stock carbs and k&n pods.I thought my jetting was perfect I could be wrong.But the thing was a turd with the fattys on it. I put my old pipes back on and never changed the jetting or anything and the power was right back.It just started a little harder until i changed the pilots back to 25s and jetted back up to 340 on the mains. Maybe im missing something else i hope not because i sold them already. Are the old mid top pipes that good of a pipe? Thanks Mike