The Traxxas Resonator aluminum tuned pipe is specifically engineered to fit right in the chassis and compliment the TRX® 2.5R/3.3 racing engines. 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. The Traxxas engineering team knows TRX Racing Engines better than anyone so a Resonator pipe delivers dyno-proven results that drivers can see, hear, and feel every time they pull the trigger. Each Resonator pipe is fully polished by hand to a beautiful mirror-chrome finish with a laser-etched logo. Mounting hardware is included.