Wagner Tuning BMW N55 Downpipe (Catless/De-Cat/Decat) - F-Series 1/3/4 Series M135i 335i 435i F20 F21 F30 F31 F34 F32 F33 xDrive - Turbo Outlet Straight Pipe Exhaust Upgrade - Pre 06/2013 - 304 Stainless - Stage 2/Remap Ready - OEM 18328603875

Transform throttle response and turbo spool on your BMW N55

Looking for a serious exhaust upgrade for your N55-powered BMW without compromise on fit or finish? This Wagner Tuning de-cat turbo outlet pipe is a direct bolt-on replacement for the factory unit, engineered to free up exhaust flow, sharpen response and unlock real performance potential. Expect quicker turbo spool, a deeper, more aggressive tone and noticeable gains in horsepower and torque thanks to reduced exhaust restriction.

We have fitted this in-house and the quality is exactly what you want from a premium performance part. Our customers love the improved drivability, stronger mid-range pull and the cleaner, crisper sound under load.

Why choose this performance down pipe

• Premium 304-grade stainless steel construction (1.4301) for durability and corrosion resistance
• Direct replacement for the factory component with OE-style fitment points
• Lower exhaust backpressure for increased power and torque
• Reduces heat stress on the turbocharger for more consistent performance
• Straight-through de-cat design for maximum exhaust flow
• Large 105 mm connection for excellent gas velocity
• Enhances exhaust note with a sporty, purposeful sound

Vehicle compatibility

Designed for BMW N55 petrol models built up to 06/2013, including xDrive variants:

• BMW M135i F20 and F21 up to 06/2013
• BMW 335i F30, F31 and F34 up to 06/2013
• BMW 435i F32 and F33 up to 06/2013

Replaces OEM BMW part number: 18328603875

Perfect for performance tuning

Ideal for enthusiasts planning a remap or Stage 2 calibration on the N55 engine. This de-cat pipe reduces exhaust restriction, helping your turbocharger breathe more freely and supporting higher power goals. Popular search terms this product addresses include M135i decat pipe, F30 335i down pipe, F32 435i exhaust upgrade, N55 de-cat, BMW turbo down pipe and straight pipe conversion for pre-06/2013 F-series models.

Installation and support

Professional fitting recommended. MJ Modifications in Warwickshire can install this item and provide any required supporting work. For a fitting quote or advice, email info@mjmodifications.co.uk.

Important information

• For off-road or motorsport use only unless an appropriate catalyst is installed elsewhere in the system
• Removing catalytic converters will almost invariably make your vehicle illegal for road use
• ECU calibration is required to prevent an engine management light and to optimise performance

Upgrade your BMW’s N55 exhaust path with a proven, high-flow solution from Wagner Tuning. Exceptional fit, robust materials and real-world performance gains make this the go-to decat down pipe for pre-06/2013 F-series M135i, 335i and 435i owners.