Traxxas Pro .15 to TRX 2.5 engine conversion has a tune Pipe, bellcrank, & Throttle Servo Horn made of plastic. Linkage wire made of steel.
Tune Pipe Length: 114mm (4.5")
Header Pipe Outer Diameter: 13mm (.51")
Requires: Removal of material from the engine mount will be needed. This procedure is illustrated on the instruction sheet.