Traxxas Resonator aluminum tuned pipe for Revo is specifically engineered to fit right in the chassis and compliment Revo's TRX 2.5R racing engine. The single-chamber design dramatically increases bottom-end punch by nearly 20% between between 10,000 and 15,000rpm, and continues to pull strong with a 10% increase from 15,000 to 30,000rpm. It's perfect to provide that extra snap of acceleration off the line. INCLUDES: (1) Tuned pipe for the RevoCOMMENTS: Tuned pipe, Resonator, R.O.A.R. legal (single-chamber, enhances low to mid-rpm power)