Cobra Sport / (Mk4) ST (2019>)

Ford Focus ST (Mk4) Turbo Back Performance Exhaust

Part Number: FD122ATP77

Requires mandatory ECU reflash.

£1,333.33 Excl. VAT
£1,599.99 Incl. VAT

Cobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. Our sports exhausts range is fully guaranteed to give you assurance of our quality.

This Ford Focus Mk4 ST cat back performance exhaust is made in 3"/76.2mm pipework and fits from the Turbo backwards (turbo-back) replacing the Downpipe, GPF, centre and rear sections.

The high flow sports cat version will enable you to pass a UK MOT emissions test or police road side checks. This exhaust is also sold with a de-cat for motorsport and off road use only and will NOT be able to pass a UK MOT emissions test or police road side checks.

The non-resonated option makes the system louder as it excludes the centre silencer and therefore, has a sportier exhaust note. This exhaust however, is also available as a resonated version (including centre silencer) which is a quieter option.

IMPORTANT: this exhaust removes the GPF filter and will require engine tuning at time of fitment to cancel the EML light.

Fitment to GPF equipped models is for motorsport and off road use only.


The product images shown are for illustration purposes only and due to product enhancement may not be an exact representation of the product.

EML lights may activate after removing the standard O/E catalyst. An ECU Re-map is recommended to correct this problem and stabilise all power increases.

The Ford Focus ST has long been a favourite amongst hot hatch fans, especially in the UK, ever since the launch of the Mk1 ST170 back in 2002. The Mk2 ST moved Ford’s hot hatch game on even further in 2005 when they fitted it with a thundering 2.5 5-Cylinder engine. And in 2012, despite losing a cylinder and half a litre of capacity to its predecessor, the Mk3 still sold in the thousands.

Every generation of Focus ST has had seemingly limitless tuning potential thanks to their horsepower-hungry engines and playful handling characteristics. Cobra Sport have enjoyed enormous success in this field, with their performance exhausts for both the Mk2 and Mk3 Focus STs being amongst the best-selling systems in the market.

Aiming to replicate this success, Cobra Sport are proud to announce their latest product range for the Ford Focus ST Mk4. Over the past few months, their R&D team have been hard at work developing an extensive range of performance exhaust systems that will cater to the needs of any fast Ford enthusiast.

Also available in the range is Cobra Sport's Cobra’s unique ‘Venom’ range. For those who want a further improve sound levels, the Venom exhaust removes the rear silencer to offer the biggest sound increase whilst keeping a sporty exhaust tone  (+8.5db in GPF-Back Venom configuration).

Like all Cobra Sport exhausts, the Mk4 Focus ST systems are TIG-welded from high-quality T304 stainless steel and the mandrel-bent pipework is a full 3in (76.2mm) in diameter for maximum sound and tuning potential.

With over 25 years in the performance exhaust industry, each Cobra Sport exhaust system is designed, manufactured and tested in Sheffield, the heart of the UK steel industry. Cobra Sport utilise TIG-welding techniques to ensure a flawless finish and quality that you can rely on.

Ford Focus ST Mk4 Promotional Video (3" GPF-Back Exhaust)

Cobra Sport Exhausts Ford promotional video.

Cobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. Our sports exhausts range is fully guaranteed to give you assurance of our quality.

This Ford Focus Mk4 ST cat back performance exhaust is made in 3"/76.2mm pipework and fits from the Turbo backwards (turbo-back) replacing the Downpipe, GPF, centre and rear sections.

The high flow sports cat version will enable you to pass a UK MOT emissions test or police road side checks. This exhaust is also sold with a de-cat for motorsport and off road use only and will NOT be able to pass a UK MOT emissions test or police road side checks.

The non-resonated option makes the system louder as it excludes the centre silencer and therefore, has a sportier exhaust note. This exhaust however, is also available as a resonated version (including centre silencer) which is a quieter option.

IMPORTANT: this exhaust removes the GPF filter and will require engine tuning at time of fitment to cancel the EML light.

Fitment to GPF equipped models is for motorsport and off road use only.


The product images shown are for illustration purposes only and due to product enhancement may not be an exact representation of the product.

EML lights may activate after removing the standard O/E catalyst. An ECU Re-map is recommended to correct this problem and stabilise all power increases.

Promotional Video

  • Lifetime Warranty

    Cobra Sport exhausts systems come with a lifetime warranty for the original purchaser, giving you ultimate peace of mind.

  • UK Manufactured

    All Cobra Sport exhausts are manufactured in the UK from certified grade 304 stainless steel and TIG welded for a superior quality finish.

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