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Top » Catalog » Engine » Decats & Exhausts » ST250Catback » 3inch CAT Back Exhaust System Ford Focus ST 250 Ecoboost 12-on

Tuning Developments Exhaust Components for the popular MK3 Ford Focus ST 250 Models with 2.0 Ecoboost Engine

Item: 3inch CAT Back Exhaust System (Non-Resonated)

One of many parts available from Tuning Developments for your MK3 Ford Focus ST 250! Manufactured here in house in the UK, with all joints utilising superior flanges and bolts as opposed to lesser quality sleeve jointing with clamps. The Tuning Developments CAT Back Exhaust is made from high quality T304 grade stainless steel, which is mandrel bent ensuring that pipes aren’t crushed or deformed when being bent for better gas flow and sustained pipe bore size throughout the system, this in turn helping to maximise performance gains. On top of all this, the weight of this exhaust system is substantially less than the factory system, improving performance further again! The exhaust is also fabricated with further modifications in mind, neatly tucked up to the underneath of the chassis so that clearance is not an issue, even on lowered cars with coilovers fitted.

This CAT Back Exhaust System from Tuning Developments will interchange with the factory downpipe/cat section of exhaust, making install very simple and straight forward, but ensures a true full 3inch Exhaust with a clever adaptor which can be removed when upgrading to our 3inch Decat/Downpipe later on, it also utilises factory hanging points to ensure fitment is as good as the factory exhaust system.

The Tuning Developments CAT Back Exhaust system is available with or without a resonated centre section, depending on how loud you would like the exhaust to be, either system will fit on a factory car. The resonated exhaust system from Tuning Developments is trackday noise limit friendly which is a big thing to consider for a lot of Ford Focus ST 250 owners who intend on using their car for public trackdays or even competition use.

Checkout our Youtube video to listen to various sound clips of the exhaust system, showing sound from inside the vehicle and from the outside.

From doing in depth dyno testing, we expect gains to be anything upto 50bhp from fitting this Tuning Developments CAT Back Exhaust System, when in conjunction with our 3inch decat pipe and custom ECUtek Tune. These items are also listed on our webshop so be sure to check those out too! Discounts are available for a ‘Turbo back exhaust system’ consisting of the 3inch Decat Downpipe and also 3inch CAT Back Exhaust from Tuning Developments. Further performance gain can be had from Solid Intercooler Boost Pipe Kit and Cold Air Intake Kit upgrades and ECUTeK ECU Remapping, all available through Tuning Developments, All items are available as Performance Packages for a simple drive in, drive out service also.


MK3 Ford Focus ST 250 2.0 Ecoboost Hatchback 2012-on 3inch Non-Resonated CAT Back Exhaust System
Ford 2.0 Ecoboost 3inch Non-Resonated CAT Back Exhaust System

Trade enquires are welcomed for our range of Ford Focus ST products, please contact us for more information on

This product was added to our catalog on .