This is a Nitro Rustler Pro .15 to TRX 2.5 engine conversion set from Traxxas. It allows you to mount the newer 2.5 engine to an older Nitro Rustler, Nitro Sport and Nitro Stampede.
Requires: 2.5 engine and stock clutch system
Tune Pipe Length: 114mm (4.5")
Header Pipe Outer Diameter: 13mm (.51")