This is an RB Nitro Super-Charger for the HPI Savage with a .21-.32 engine. FEATURES: Adapts to all .12-.26 RC engines on most chassis. Polished aluminum finish Top of the Super-Charger has the "RBINNOVATIONS.COM" decal High output turbo impeller boosts air intake by 50-200% and increases engine horsepower Low mass turbo impeller design minimizes power drawn from the engine Parts are precision machine from high strength aircraft grade aluminum construction. Auxiliary pressure port (available separately, RBVG1305) can be used to boost fuel flow to the the engine. This allows the engine to run consistently from a full to empty fuel cell. Fits the Savage .21-.32. INCLUDES: One RB Nitro Super-Charger One mounting bracket One idler pulley One belt One anti-kink spring One flexible 15" and 3-3/4" flexible section of tubing One three shoe flywheel One instruction manual Two decal sheets One engine performance enhancements/tuning sheet REQUIRES: Installation and tuning SPECS: Length: 1.50" (38mm) Width: 2.00" (51mm) Height: 1.56" (39mm) COMMENTS: This is a high-tech breakthrough for RC engines. After installation, it is important that the engine is re-tuned by an experienced person. RB Innovations does not accept responsibility for any engine damage due to improper skill or use of the product. Rb InnovationsPart RBVRBK10533