look for the exhaust that goes on the traxxas nitro stampede, the manifold only works with a side exhaust engine, any of these "could" work, look on your car to see if one of these could fit.

http://www2.towerhobbies.com/cgi-bin...?&I=LXJF71&P=7 (loud)
http://www2.towerhobbies.com/cgi-bin...?&I=LX3469&P=0 (quiet)
http://www2.towerhobbies.com/cgi-bin...?&I=LXD486&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXN374&P=0 (quieter)
http://www2.towerhobbies.com/cgi-bin...?&I=LXU708&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXU710&P=0 (use with first one and silicon tubing)
http://www2.towerhobbies.com/cgi-bin...?&I=LXARR0&P=0 (meant for a plane but worked good on my stampede)

all these will fit on a .11, .12, .15