M139 3.5-Inch Mandrel-Bent Downpipe

The Weistec M139 Downpipe is engineered for Mercedes-Benz vehicles equipped with the M139 engine, aiming to enhance performance through improved exhaust gas flow. Constructed from durable, low-carbon 304 stainless steel, this downpipe features 3.5-inch diameter piping that is 100% mandrel bent and TIG welded for optimal flow and longevity. The turbine flanges are CNC machined from 304SS to ensure a perfect mating with the turbocharger, utilizing the OEM clamp. Laser-cut mounting brackets are included to align precisely with factory mounting points, facilitating a straightforward bolt-on installation. Key benefits of this downpipe include increased exhaust flow, which contributes to an improved exhaust note and enhanced turbo response. It also offers increased knock and detonation resistance. Installation of this downpipe requires a W.2 ECU tune. It is important to note that this product may not be emissions compliant, and buyers should check local laws prior to installation. The product is not street legal in all US states.