Depending on your budget. I have a ballistic 4.5 with timing And a 13t with an rx8+ boost. Pass everyone on the track on the straights. 6min main still has 6.97v coming off the track and ran a few practice laps. I also run geese not fluid diffs. Meaning more drag. I run thunder power 5300 65c. Worth every dollar spent. I've ran nano techs, hobby people and reedys and the thunder power delivers 100% till the lvc hits. Just my .02