Airtec Motorsport Stage 4 Intercooler upgrade for the Ford Focus ST225 Mk2 2.5 turbo, developed for heavily modified vehicles with power outputs of 400+ hp. This setup is designed for owners who want to get the most out of their Focus ST during sporty road driving and track use.
For the Stage 4 kit, Airtec has adapted the popular Focus RS Intercooler so that it fits perfectly behind the Focus ST225’s bumper. In addition, the proven 2.5-inch ‘big boost’ pipe system has been adapted for use with the Focus ST turbo, ensuring optimal utilisation of the entire airflow between the turbo, Intercooler and engine.
the intercooler utilises a 60 mm high-flow core that is approximately twice as high as the original Intercooler and nearly 100 mm longer. This results in a massive increase in capacity and an impressive 127 per cent increase in frontal area compared to the standard unit.
The combination of the smooth-flow cast end tanks and the integrated Air Ram Scoop ensures that as much airflow as possible is directed through the intercooler, resulting in significantly lower Intake temperatures during prolonged load.
The included 2.5-inch Charge Pipe upgrade replaces the original 2-inch pipework. Thanks to the larger diameter, airflow is less restricted, resulting in better response and more power. During dynamometer tests, the Charge Pipe upgrade alone delivered a gain of 11.8 hp and 12 nm of torque.
Do you want to keep the original symposer? Then opt for the cold-side Charge Pipe with symposer outlet.
the intercooler is available in Pro-Series Black or Natural Silver. The Charge Pipes are supplied exclusively in Pro-Series Black.
Important for pre-facelift models: The pre-facelift Focus ST225 has a different radiator design to the facelift ST225 and Focus RS models. As a result, the left-hand (cold side) 2.5-inch silicone hose may run very close to the radiator bracket after fitting this Stage 3 kit.
To create sufficient space, Airtec recommends removing the bolt from the radiator bracket, moving the bracket slightly to the right and then drilling a new mounting hole before refitting the bolt. This is a simple modification that takes just a few minutes’ extra work, but is necessary to create sufficient clearance for the larger 2.5-inch cold-side hose.
If the available space is still insufficient after this, Airtec recommends switching to a Focus RS radiator, which offers more space around the pipework.
Benefits
• Designed for
builds producing 400+ hp• 60 mm high-flow
core• 127% larger frontal
area• Air Ram Scoop for maximum
cooling• 2.5-inch Charge Pipe
upgrade• 11.8 hp and 12 nm gain from the pipes alone•
Smooth-flow cast end tanks•
Lower
Intake temperatures• Increased power and torque•
3-year warranty
Compatibility
Ford Focus ST225 Mk2 2.5 turbo
Frequently Asked Questions
What is the difference between the Stage 3 and Stage 4 intercoolers?
The Stage 4 has been developed for higher power outputs of 400+ hp and utilises modified 2.5-inch Charge Pipes specifically tuned for the Focus ST turbo.
What power output level is this kit suitable for?
This intercooler set is designed for heavily tuned Focus ST225 models with power outputs above 400 hp.
Do the 2.5-inch Charge Pipes actually deliver extra power?
Yes, during dynamometer tests, a gain of 11.8 hp and 12 nm of torque was measured simply by fitting the larger Charge Pipes.
Does this kit fit pre-facelift models?
Yes, but Airtec recommends a minor modification to the radiator support to create sufficient space for the larger 2.5-inch silicone hose.
