You may want to forget the 98.5, and go with 101, 105, 110 I am sure you will get it w/ one of these. Wordslinger is running LeoVince 4.5gr rollers, and likes them alot. With your set up I believe they will work for you as well. Your pipe will give you plenty of top end, and the light rollers will give you the bottom. Heavier clutch springs will also help you out. Both 2t, and 4t are running the heaviest Malossi, Leo, or whatever brand you choose