Um, actually that statement is bullshit. You should say "most" instead. I had a CBR929RR, I dropped the stock exhaust, and got rid of the exhaust valve, HTEV I believe it was called. I mounted a Full Hindle system with a Ti end can. I gained power everywhere through the range. At no point was the stock system more powerful than the Hindle. Yes, I had it mapped.karl_1052 said:
what do you base that claim on?
exhaust systems for bikes with exhaust valves actually hurt low end performance for a gain on top.