If I had it to do all over I would have gotten the plain backing plate and a starter box instead of the pull starter. HPI makes a header pipe for rear exhaust engine for the MT. I am running a OS pipe but it has since been discontinued.
Header pipe
http://www3.towerhobbies.com/cgi-bin...?&I=LXFAZ9&P=Z
This tuned pipe looks promising
http://www3.towerhobbies.com/cgi-bin...?&I=LXPNB9&P=Z