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Ford Focus RS - Eventuri

Ford Focus RS

Performance Increase : 10-15hp, 12-15ft-lb

The MK3 Focus RS Eventuri intake has been developed through extensive dyno testing and temperature analysis. By integrating an effective cold air feed, which the stock system lacks and coupling that with our Patent Pending Venturi housing, our intake delivers industry leading results – consistently.

The Eventuri Difference

The RS Eventuri system uses our Patent Pending Carbon fibre Housing which provides an aerodynamically efficient airflow path from the filter to the turbo tube. Not just another cone filter with a heat shield but a unique design which allows airflow to remain laminar and thus improve the turbo efficiency.


The Eventuri Focus RS intake system consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. Here are the details for each component and the design ethos behind them:

Each intake system consists of:

  • Carbon Fibre Venturi Housing
  • High Flow Double Cone Air Filter
  • Aluminium Cowl for smooth airflow entry
  • Carbon Fibre Inlet Tube with integrated sensor mount
  • Neoprene Tubing for the cold air feed
  • Laser Cut Aluminium Scoop
  • Laser Cut Stainless Steel Brackets
  • High quality Silicon couplers with OEM specification hose clamps

Carbon Intake Housing Assembly

The filter housing comprise of a high flow filter, aluminium cowl, laser cut bracket and the carbon housing itself. The carbon housing shrouds the reverse mounted filter and smoothly shapes the airflow down to the intake tube. This smooth reduction in cross sectional area invokes the Venturi effect where the airflow accelerates whilst maintaining laminar conditions. It can be thought of as a large velocity stack – below is a diagram to show the comparison between our patent pending design and a regular intake system. Further details can be read in the Technology page.

Carbon Fibre Intake Tube

We designed a connecting tube from the filter housing to the crossover pipe to be as smooth as possible. At one end it is matched in diameter to the filter housing and then tapers smoothly down to match the diameter of the crossover pipe. This ensures that airflow is not impeded and remains laminar to the turbo thus reducing the drag on the turbo.

Cold Air Feed

Our cold air feed solution is a unique feature on this system which demonstrates our comprehensive testing and analysis procedure. The standard air feeds to the stock airbox are very small and are further compromised by the small openings they use behind the front grill for ambient air entry. We believe this is one of the reasons Ford opened the airbox as if it were to breath solely through the two stock feeds, the intake would have been a huge restriction under load. Under testing with a 70mph fan directed into the front grill, we were unable to obtain any meaningful flow coming through the stock feeds. So we had to think outside the box and design an alternative cold air feed.

Our solution consists of an aluminium scoop and ducting to saturate the filter opening with cold air. The scoop secures to a conveniently located cutout on the undertray and the flexible ducting then mounts to the filter housing bracket. With the car in motion, ambient air is forced upwards through the ducting and displaces heated air from around the filter housing to ensure low intake temperatures. In fact with an engine fully warmed up, our intake system provides the turbo with lower intake air temperatures than the stock system. Since the air feed is not directly sealed to the filter, water ingress is not an issue. Any water will either flow back down the tube or disperse before entering the filter.


The standard airbox is open to the engine bay and also has 2 small air feeds from the slam panel. The cold air feeds are very inefficient due to their size and also because they terminate in a chamber above the radiator – with very small openings for ambient air to get into. As a result, a very minimal volume of ambient air flows through the feeds to the filter. A consequence of the open stock system is that it suffers from heat soak, however it does mean that the airbox has good volumetric airflow . So to improve on this by merely using an open cone system becomes pointless – you need 2 elements to improve on the standard design, a smooth transition to the cross-over pipe and a good cold air feed. The standard cross-over pipe itself does not pose a restriction since it has decent bore size which tapers down and matches the stock turbo inlet. Furthermore, being made from plastic it is thermally insulated from the high temperature of the turbo. A larger cross-over pipe will only be beneficial if the turbo is also changed to a larger size for higher boost levels.

Our intake system utilises a unique cold air feed from the undertray allowing the filter to be saturated with ambient air during motion regardless of how hot the engine bay becomes. This coupled with our unique Venturi housing for smooth flow results in a mid-range gain of 15hp and peak RPM gain of 10hp. The dyno graph below shows the comparison between the stock airbox and the Eventuri intake system on a standard car with standard map and exhaust.


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