I have my convertors done by a local guy, racing only, Jay Heckman owner of C2. After the trans crapped I had him open it up, clean, inspect, and re-stall it a tick looser. Seems the car likes it and Thomas trees better with it. As far as adjusting boost to race, it takes alot of passes in alot of different weather. Each year I log more and more info which helps build a database. I feel I am getting close to being "right on". This weekend I didn't give enough for the weather change, and neither did most people because there was an excessive amount of breakouts.