Traxxas Trx 2.5R Engine woth EZ starter motor and tunned pipe.New engine missing original packaging Slide carburetor provides less restrictive, straight through airflow for more power and better throttle response. PowerTune head is machined from aluminum which promotes even heat distrubution for stable engine temperatures and rock solid tuning New sleeve for improved engine efficiency and better power. Molded head protector prevents damage to the head and secures the glow plug wire. Ultra low restriction air