5424 Header Spring with O-Ring

Traxxas Header Spring with O‑Ring & Gasket (Part # 5424) is a small exhaust system replacement/tune‑up kit used in nitro RC vehicles specifically designed for the Revo® big block header assembly. It includes a spring, an O‑ring, and a gasket to help maintain a proper seal and secure connection where the exhaust header mounts to the engine or pipe flange.