Wagner Tuning BMW N55 Catless Downpipe (Decat) for M135i 335i 435i F20 F21 F30 F31 F34 F32 F33 incl xDrive | Up to 06/2013 | SS304 Stainless | OEM 18328603875 | PN 500001014

High-Flow Turbo Front Pipe for BMW N55 F-Series 1, 3 and 4 Series up to 06/2013

Free up exhaust flow and sharpen response on your straight-six BMW with this Wagner Tuning de-cat turbo front section. Built from corrosion resistant 1.4301 SS304 stainless and designed as a direct bolt-on replacement for early F-series models, it lowers back pressure, drops thermal load on the turbocharger and helps the turbo spool faster. The result is stronger mid-range punch, crisper throttle and a more purposeful soundtrack on your N55-powered BMW.

Compatible with the following petrol models built up to June 2013, including xDrive variants: 1 Series M135i F20 F21, 3 Series 335i F30 F31 F34 and 4 Series 435i F32 F33. It replaces BMW OE reference 18328603875 and features a generous 105 mm inlet connection for maximum flow, while retaining factory mounting points for a hassle-free install.

Why enthusiasts choose this performance front pipe

• SS304 1.4301 stainless construction for durability and heat resistance
• Direct-fit turbo outlet section that bolts to factory hardware
• Open-flow de-cat design to reduce restriction and improve turbo efficiency
• Lower EGTs and improved consistency on spirited drives and track days
• Noticeable gains in torque delivery and turbo response
• Large 105 mm connection for freer breathing
• Engineered by Wagner Tuning for precise fit and quality

Real-world results

We have installed this race front pipe on multiple customer cars and our own builds. Fitment has been spot on, the sound is refined yet more assertive, and feedback on drivability and performance has been excellent. If you are preparing for a remap or simply want your N55 to breathe properly, this is a proven upgrade.

Fitment guide

• 1 Series: M135i F20 F21 produced up to 06/2013
• 3 Series: 335i F30 Saloon, F31 Touring, F34 Gran Turismo produced up to 06/2013
• 4 Series: 435i F32 Coupé, F33 Convertible produced up to 06/2013
• Works with rear-wheel drive and xDrive models

Replacement for OE part number 18328603875.

Installation and support

• Professional installation recommended
• Based in Warwickshire, MJ Modifications can supply and fit. Request a fitting quote at info@mjmodifications.co.uk
• We recommend renewing the turbo to downpipe gasket during fitment
• ECU calibration may be required to prevent warning lights when running without a catalyst

Compliance notice

For off-road or motorsport use unless a suitable catalyst is retained elsewhere in the exhaust. Removing all catalytic converters is not legal for road use. An ECU solution may be necessary to avoid fault codes.

Compatibility check

We will verify vehicle compatibility before dispatch. Please provide your UK registration or the last 7 digits of your VIN at checkout.

Part numbers and warranty

• Wagner Tuning PN: 500001014
• Replaces BMW OE: 18328603875
• Warranty: 2-year manufacturer warranty

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