I went from a 2.6 kb to a F1a and dam did i love my procharger. I made more power with the same amount of boost on the f1a then I did with the kb. I didn't have all the heat soak either I used just run to the store down the street and I couldn't even touch the kb cause it was so freaking hot. Only downside was I had to launch my car above 4k to get the power quick when I street raced.