I made the same mistake with my revo, got that pipe for my 3.3. Hadda run extra hot plugs at first til I got the lil' bugger tuned. The thing was junk, no way is it close to be tuned for that motor. Waysted tons o' fuel a plenty too, so I cleaned it and mailed it back that day. The Traxxas stock pipe is the best since it was designed for that motor.