Steve, I still have the 468 in there. The only thing different is the race aero setup, and the 830's. It just seems like my rpm's are way to high at cruising speed. 4500rpms at 40-45mph...seems to high to me. I think they are 39's in the v-drive right now. I was told the next gear up on the c-500 was a 41, then it jumps to a 50. Let me know what you think. Thanks, Marc