Well I put my stock pipe back on the bike after riding for a half hour with the kerker and then road for an hour with the stock pipe. First of all man is it quiet. Anyway I gave it full throttle at curtain RPM's and it seams that the flat spots I had on the dyno and 6000 and 9000 were gone. Mind you it could be my imagination but it felt a lot better. It does not feel like it pulls as hard in the low Rpm's but it pulls a lot stronger in the higher range 8000 and above. The kerker had way more power down low. With the kerker I could wheelie at 5500 RPM and with the stock I could barely lift the wheel around 6000, like a couple inches. This is really starting to iritate me now. I thought it wouldn't but I am going to take the bike back and get mike to do one pull on the Dyno with the stock pipe and hope fully it will be in the range of 95 to 98 stock HP. If not then 02 GSXR 750 here I come jk Man I hope it is gonna be around there but I fear the worst for some reason.