DONGMAO BMW M135I F21 N55 3.0T Mid-Tail Cat-Back Single Muffler Dual Valve Dual Outlet BMW IM

Overview

2013 BMW M135I F21 N55 3.0T built by Dongmao as a direct-fit exhaust system. Every unit is assembled on a platform-specific jig, so flange angles, hanger positions and tip alignment repeat from the first unit of a batch to the last.

Tube work is T304 Stainless with mandrel bends throughout. Welds are back-purged TIG, inside and outside, then checked for penetration before the part moves to finishing. The valve system is cycle-tested before packing.

What is included

• Complete pipework with muffler and tips as shown
• Clamps, gaskets and mounting hardware
• Valve actuator, wiring harness and remote control
• Export carton with foam protection