I have an 03 zx9r with the factory filter, a 4 degree advancer and a Muzzy round slip on. This bike had a lot more balls with the Jardine B/O that it had when I bought it. Immediately after adding the Muzzy, I noticed a decrease in acceleration down low in first. I had my bike jetted (or so I thought) but I soon had it dyno tuned. On my dyno sheet, it says they removed the 155 jets and replaced them with 152s and my HP increased from 128 to 133.4. I have decided that I really don't care about the max hp. I want the bike to run like before. The mid and top seem fine but it doesn't pull hard until I go to second gear. The dreaded lag is back also when I first pull the throttle. Should I go back to the Jardine? Should I go with the oval Muzzy? Muzzy says that the oval and round pipes performance is the same.And last when I jet this (doing it myself this time, what is the recommendation for the mains. I read the outer and inner should be different. And how is it possible that I have 152 main jets in my bike from a Dyno tune if everyone else is going up in the 160's? Please help.