Exhaust Downpipe For N55 135i M235i 335i 435i F22 F30 F32 2013+

Top Tuning Technical requirement :

1: All materials are stainless steel 304, and wall thickness 1.5mm.
2: All flanges must be leveled after welding. The welding seam should not be larger than 0.3mm.
3: Surface brushed or polished treatment.
4: The inside of the finished pipe must be ensured that there is no oil, burrs and dust.