Wagner Tuning BMW M57N2 Diesel Catless Downpipe Kit

Wagner Tuning BMW M57N2 Diesel Catless Downpipe Kit

The Wagner Tuning catless downpipe kit is built to improve exhaust flow on BMW models fitted with the M57N2 engine – a 3.0-litre straight-six diesel found across a range of E-series BMWs. By replacing the restrictive factory downpipe and removing the diesel particulate filter (DPF), the kit lowers exhaust back pressure, letting gases exit the turbo more freely. The result is improved torque, sharper throttle response, and reduced heat stress on the turbocharger.

Manufactured from SS304 stainless steel and designed as a direct replacement for the OEM part (18308508523), the downpipe fits in place of the factory item with no cutting, welding, or custom fabrication required.

Key Features

• SS304 stainless steel construction for durability and corrosion resistance under high exhaust temperatures
• 70mm internal diameter for improved gas flow over the restrictive factory pipe
• Direct OEM replacement – no modifications required
• Reduces thermal load on the turbocharger, helping extend its service life
• Noticeable gains in torque and throttle response
• Replaces the factory DPF and downpipe assembly as a single unit

Vehicle Fitment

This downpipe kit suits BMW E-series models fitted with the M57N2 3.0-litre diesel engine, including the 335d, 535d, 635d, and several X-series variants. Please use the vehicle lookup tool on this site, or check the Vehicle Fitment tab, to confirm compatibility before ordering.

Important – Software/ECU Notice

Removing the DPF will trigger fault codes in the engine management system (DME – Digital Motor Electronics). The vehicle’s software will need to be updated or remapped by a suitably qualified specialist to prevent error codes. This product is not road legal in many regions – please check your local regulations before fitting.

Warranty and Usage Disclaimer

Wagner Tuning catless and sports exhaust products are intended for performance optimisation on otherwise standard vehicles. This product is not intended for use on vehicles with a tuned or modified ECU, nor on vehicles running ‘burble’ or anti-lag style tunes. Wagner Tuning accepts no responsibility for damage caused by engine malfunctions, rich or lean running conditions, or any modifications to the vehicle beyond the fitting of this part.

Any warranty claim will require proof that the engine remains in standard, unmodified condition and has been maintained in line with the original manufacturer’s specifications. The end user is solely responsible for ensuring use of this product complies with the laws and regulations in their region.