VRSF N55 4" Sports Cat Catted Downpipe for BMW F-Series M135i M235i M2 335i 435i, 200 Cell High Flow SS304, Fits F20 F21 F22 F30 F32 F33 F87 (2012-2019)

High-Flow Sports Catalyst Front Pipe for BMW N55 F-Series

Transform the way your N55-powered BMW drives and sounds with this four inch sports catalyst front section. Engineered for the F-chassis six cylinder turbo models, it replaces the restrictive factory converter with a 200-cell high-flow metallic catalyst to release horsepower, sharpen throttle response and add a deeper, more purposeful exhaust tone while retaining a catalyst.

Built from 304-grade stainless steel with TIG-welds and precision CNC flanges, this performance exhaust upgrade is designed to reduce back pressure, speed up turbo spool and unlock serious gains when paired with suitable calibration. With the right tuning, customers typically report increases of 20 to 25 bhp along with a stronger mid-range and improved drivability. We run these on our own N55 projects at MJ Modifications and customer feedback on fitment, finish and results has been consistently excellent.

Why this sports catalyst is a must-have upgrade

• 200-cell high-flow metallic catalyst for maximum gas velocity and performance
• Full four inch primary section for superior flow and quicker spool-up
• 304 stainless construction, mandrel bends and TIG-welded seams for durability
• CNC-machined flanges for precise alignment and OE-style fit
• Typical 20 to 25 bhp gains with a Stage 2 map, plus noticeable torque increase
• Lifetime warranty on the pipework, 1 year on the catalyst and ceramic coating

Optional ceramic thermal barrier

Add a Cerakote high-temperature coating rated to 1800°F to help retain heat within the exhaust tract, aiding under-bonnet temperature control and overall thermal management. Ideal for track-focused builds or hard-driven road cars.

Compatibility guide

Suits the following N55-powered BMW F-series petrol models:

• 2012 to 2018 F30 BMW 335i and 335xi
• 2013 to 2018 F32 and F33 BMW 435i and 435xi
• 2012 to 2018 F20 and F21 BMW M135i and M135xi
• 2013 to 2018 F22 BMW M235i and M235xi
• 2015 to 2019 F87 BMW M2

Build date note: M135i and 335i up to 07-2013 use the 3.5 inch version. M135i and 335i from 07-2013 onwards use the four inch version. All M235i and 435i models use the four inch version.

Also available

Alternative versions include a decat option and a 3.5 inch size for earlier cars. This listing is for the four inch sports catalyst.

Fitting and support

Direct bolt-on installation to the factory system. For professional fitting, choose MJ Modifications in Warwickshire. For a fitting quote or to confirm compatibility, email the last 7 of your VIN to info@mjmodifications.co.uk.

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