:ummm: This my first post and I hope I am asking in the correct thread. My question is: when going to a Kerker 4-2-1 how much bigger in a so called jet kit should you go? DJ stage 7 / DJ stage 1? I have also heard good things about Morley's. I already have a Kerker 4-2-1 that I have bought a year or two ago. My bike has been totally dissmanteled to the frame for about 2 years . now I am going back together with it. I just want to do it correct the first time.... Thanks