Just picked up the b5m, What motor should I get? First car since 2001. 17.5T looks slow, I might prefer modified buggy class. Do I choose 13.5, 10.5, 9.5? What are other guys running? Looking at Reedy Sonic, I will be driving the car at 702 Race Way in Vegas. Thoughts and opinions appreciated! I am starting from scratch just getting back into the hobby, Tax return well spent.