Wagner Tuning BMW E/F-Series N57 25d/30d/40d Catless Downpipe

Unlock serious diesel performance with this stainless decat pipe engineered for the N57 platform. Reduce exhaust restriction, speed up turbo spool and unleash torque with a direct-fit replacement that keeps factory alignment and mounting points. Built from high-grade SS304 with precision welds and a 70 mm bore, this race-only exhaust section delivers the free-flowing exhaust path your build needs.

We run this hardware on our own projects and customer cars, and the feedback is consistent - sharper response, stronger mid-range pull and lower exhaust gas temperatures under sustained load. It is a true plug-and-play swap for the OE unit and an ideal foundation for remaps and further upgrades.

Why choose this performance decat pipe

• SS304 stainless construction for durability and corrosion resistance
• 70 mm diameter straight-through design to cut back pressure
• Direct replacement - OEM-style connections for hassle-free fitment
• Helps reduce thermal stress on the turbocharger during high load
• Optimised flow for improved torque and quicker turbo response
• Designed for track, off-road and motorsport use only

Fits the following N57 diesel applications

• 3 Series E90 E91 E92 E93 - 325d, 330d, 330d xDrive - 2007 to 2013
• 3 Series F30 F31 F34 GT - 330d, 330d xDrive - 2011 to 2016
• 5 Series F10 F11 F07 GT - 525d, 530d, 530d xDrive - 2010 to 2011
• 7 Series F01 F02 - 730d, 740d and xDrive variants - 2007 to 2012
• 7 Series F01 F02 LCI - 730d xDrive - 2011 to 2015
• X3 F25 - 30d, 30d xDrive - 2009 to 2016
• X4 F26 - 30d, 30d xDrive - 2013 to 2016
• X5 E70 LCI - 30d, 40d, xDrive - 2009 to 2013
• X6 E71 - 30d, 40d, xDrive - 2009 to 2014

Replaces OEM BMW part number: 18308511143

Common search terms this product covers

BMW N57 decat pipe, turbo down pipe for N57, straight pipe diesel, race exhaust section, stainless diesel performance pipe, N57 330d 530d 730d 740d upgrade, E90 E92 F30 F10 F01 exhaust mod, xDrive diesel performance, 30d 40d performance exhaust, DPF-cat replacement section, 70 mm N57 exhaust, track-only decat for BMW diesel.

Fitting and support

Professional installation recommended. For supply and fitting, choose MJ Modifications in Warwickshire - request a quote at info@mjmodifications.co.uk.

Important notes

• For off-road, track or competition use only
• ECU calibration is required to prevent warning lights after installation
• Removing emissions control devices such as a DPF or catalyst is not legal for use on public roads