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Cobra

Cobra Sport Front Downpipe for BMW 1 Series F40 M135i xDrive (M135ix) 2019+ — Sports Cat or De-Cat, Resonated or Non-Resonated — 3 Inch (76.2mm) T304 Stainless — Connects to Cobra GPF-Back or Cat-Back Performance Exhaust

Cobra Sport Front Downpipe for BMW 1 Series F40 M135i xDrive (M135ix) 2019+ — Sports Cat or De-Cat, Resonated or Non-Resonated — 3 Inch (76.2mm) T304 Stainless — Connects to Cobra GPF-Back or Cat-Back Performance Exhaust

£1,097.82
£1,219.80 £1,097.82
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FRONT PIPE
CENTRE SECTION
FITMENT

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

BMW F40 M135i xDrive Front Pipe Upgrade by Cobra Sport - 76.2 mm 3 inch Stainless Performance System

Give your M135i xDrive the soundtrack and response it deserves with Cobra Sport’s turbo front pipe. This UK-made system uses 304-grade stainless steel throughout with mandrel-formed 76.2 mm tubing, meticulous TIG welds and CNC-cut flanges for a precise fit and long-term durability. Available with a high-flow sports catalyst or a catless option, plus resonated or straight-through centre section choices, it is a proven way to reduce back pressure, sharpen throttle response and unlock a deeper, more purposeful tone.

This front section is designed to mate specifically to Cobra Sport rear systems - choose the connection to suit either Cobra GPF-back or Cobra cat-back on your BMW 1 Series F40 M135i xDrive. At MJ Modifications we have fitted these on customer cars and our own demonstrators, and the feedback on fitment, finish and sound quality has been consistently excellent. Backed by Cobra Sport’s lifetime warranty for the original purchaser.

Why enthusiasts choose this upgrade

  • Large-bore 3 inch 76.2 mm pipework for freer breathing and improved flow potential
  • Premium 304 stainless construction, TIG welded, with precision stainless flanges
  • Choice of catted sports catalyst or catless front section for maximum flow on motorsport vehicles
  • Pick resonated for a refined note or non-resonated for a more aggressive soundtrack
  • Direct connection options to Cobra OPF-back, GPF-back or Cobra cat-back rear sections
  • Deeper, sportier tone with road-friendly refinement when resonated is selected
  • Made in Britain with a lifetime guarantee to the original buyer

Options explained

  • Sports catalyst vs catless: The high-flow sports cat retains a converter while improving flow. The de-cat option offers the least restriction and is intended for track use and off-road applications where permitted.
  • Resonated vs non-resonated: Resonated includes a centre silencer for a more civilised, bass-rich tone. Non-resonated removes the centre silencer for a louder, rawer character.
  • Connection type: Select the version that links to your existing Cobra rear section - either Cobra GPF-back or Cobra cat-back - for a seamless, bolt-on fit.

Part numbers

  • BM141A - Sports Cat, Resonated, To Cobra GPF Back
  • BM140A - Sports Cat, Resonated, To Cobra Cat Back
  • BM141B - Sports Cat, Non-Resonated, To Cobra GPF Back
  • BM140B - Sports Cat, Non-Resonated, To Cobra Cat Back
  • BM141C - De-Cat, Resonated, To Cobra GPF Back
  • BM140C - De-Cat, Resonated, To Cobra Cat Back
  • BM141D - De-Cat, Non-Resonated, To Cobra GPF Back
  • BM140D - De-Cat, Non-Resonated, To Cobra Cat Back

Vehicle compatibility

BMW 1 Series F40 M135i xDrive M135ix, 2019 onwards.

Fitment details

  • Replaces the OE front section with 76.2 mm 3 inch performance pipework
  • Runs from the turbo outlet area to the mid-section
  • When paired with a Cobra rear system, the supplied SLJ is not required

Sound and driveability

Non-resonated options deliver the most volume and drama. Resonated systems keep cruising volumes sensible while adding a deeper, more authoritative note under load. The freer-flowing design supports future tuning and pairs perfectly with Cobra Sport GPF-back or cat-back systems for a complete performance exhaust package on the F40 M135i xDrive.

Installation and support

Professional fitting recommended. MJ Modifications in Warwickshire can supply and install this system - request a quote at info@mjmodifications.co.uk. Basic ECU calibration may be required at the time of installation to prevent an EML when using sports cat or de-cat options.

Important notes

  • For off-road and motorsport use only where applicable. Always check local regulations regarding catalyst and OPF/GPF modifications.
  • Cobra lifetime warranty applies to the original purchaser only.

Why buy from MJ Modifications

We fit these Cobra Sport front sections week in, week out. Our customers praise the build quality, the straightforward installation and the way this upgrade transforms the M135i xDrive’s character. Order with confidence and get expert guidance from our team.

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