O.S. 21TM Exhaust Header

This is a replacement O.S. Exhaust Header, and is intended for use with the O.S. .21 TM T-Maxx engine.

This product is expected to become available for purchase on Sunday, December 21, 2025

• O.S. Engines .21 TM
• Traxxas T-Maxx

James Kerr Verified Owner Friday, Apr 11 2025 (6 months ago) O.S. 21TM Exhaust Header Bought this for a Dynamite Mach w .19t engine. Fits great, and is a must have for dynamite engines. The kit that comes with the dynamite engine for using the traxxas header leaks and doesn’t work well. This OS manifold resolves this issue. Christopher Bridges Verified Owner Monday, Dec 19 2022 (about 2 years ago) O.S. 21TM Exhaust Header Can be used on the factory 3.3 buy shaving down the top lip and a exhaust coupler View all reviews