Cobra Sport BMW 1 Series M135i (F20/F21) N55 3" (76mm) Turbo Downpipe / Front Pipe – 200 Cell High-Flow Sports Cat or Decat Catless HFC – Turbo Outlet Exhaust Upgrade, TIG-Welded 304 Stainless, UK Made

Unlock serious flow and faster spool on your F20 1 Series with this Cobra Sport turbo outlet front pipe for the M135i N55. Crafted in Britain from premium T304 stainless with beautiful TIG welds and CNC machined flanges, this 76.2 mm system replaces the restrictive factory catalyst to free horsepower, sharpen response and add a deeper, motorsport-inspired tone. Choose between a high-flow 200 cpsi sports catalyst or a straight-through de-cat race pipe to suit your build and usage.

Key benefits for your M135i

• Full-bore 3 inch mandrel-bent tubing from the turbocharger to the centre section for reduced backpressure and quicker turbo spool
• Two configurations: 200 cell sports catalyst for road-driven cars or non-catted track version for maximum gas velocity
• Hand-finished T304 stainless steel, argon TIG-welded, with precision CNC flanges for a gas-tight, durable seal
• Supplied with the relevant hardware and gaskets for a straightforward install
• Backed by the Cobra Sport Lifetime Warranty for long-term confidence

Proven gains you can feel

With the de-cat configuration fitted, independent testing recorded an increase of 20 bhp at the wheels and 28 lb ft of torque before any calibration work. With mapping, typical improvements of 20 to 25 hp are achievable. Expect crisper throttle, earlier boost, and a richer, sportier soundtrack.

Which version should I choose

• 200 cpsi sports catalyst High-flow metallic core designed to keep emissions equipment in place while dramatically lowering backpressure. Suitable for road use and will pass UK MOT emissions tests and roadside checks.
• De-cat straight pipe The ultimate option for track, motorsport and off-road use only. This will not pass a UK MOT emissions test or police roadside checks.

Fitment

Designed specifically for the BMW M135i F20 with the N55 engine. This exhaust front section runs from the turbocharger to the centre joint and replaces the OE catalytic converter. Available for both pre June 2013 and post June 2013 vehicles. Unsure of your build date Contact us and we will guide you to the correct part number.

Installation and support

A competent DIYer or professional can install this quickly with the supplied fixings. We recommend replacing the turbo to outlet gasket when fitting the de-cat version to ensure a perfect seal.

Want it fitted for you Our team at MJ Modifications in Warwickshire can install and set up this system. Request a fitting quote via info@mjmodifications.co.uk.

We have supplied and fitted these on customer cars and in our own projects. Feedback on the build quality, fitment and sound has been consistently excellent.

Part numbers

• BM77 200 cell sports catalyst for pre June 2013 models
• BM72 200 cell sports catalyst for post June 2013 models
• BM78 de-cat for pre June 2013 models
• BM73 de-cat for post June 2013 models

Made in the UK

Built in Britain by Cobra Sport using certified T304 stainless steel and industry-leading TIG welding for a premium finish. Covered by the Cobra Sport Lifetime Warranty for peace of mind.

Dyno data

Important notes

• De-cat version is for motorsport, track and off-road use only
• Sports cat version will pass UK MOT emissions tests and roadside checks

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