The Traxxas Resonator aluminum single-chamber tuned pipe 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. Each Resonator pipe is fully polished by hand to a beautiful mirror-chrome finish with a laser-etched logo. Mounting hardware is included.