Black Mamba 3.15″ (80 mm) Decat Downpipes for BMW X3M and X4M F9x S58 engines, expertly crafted from premium T304 stainless steel with mandrel-bent piping and handmade TIG welds for exceptional durability and exhaust flow. This 2-piece kit eliminates the restrictive main catalysts, providing a substantial 35hp gain on Stage 1 setups and an aggressive exhaust note. Optional thermal insulation reduces heat radiation by up to 50%, ensuring optimal engine bay temperatures.

Direct bolt-on installation

2-piece kit for seamless fitment

100% T304 stainless steel construction

Pipe diameter: 3.15″ (80 mm)

Thermal insulation reduces heat radiation by 50%

Proven power gain: 35hp on Stage 1 setups

Aggressive exhaust sound

Handmade TIG-welded joints for maximum strength

Complete assembly kit included

Lifetime warranty

ECU calibration required