I myself have a pullstart side exhaust (OS Cv-RX, decent engine but a little lacking compared to some of the others out there), but I also use a starter box (easier to start/restart if you stall in a race). if you get a starter box, you might as well get a new engine/exahust system. I plan on down the road getting a OS .12 TR (easy to get started and tune, and a good performer) and an RD logics pipe (I thnk on their site the pipe goes for about $60)