AIRTEC Motorsport Aluminium Under Tray for Ford Focus ST & RS Mk3

Technical Data

As part of our expanding Ford product range, AIRTEC Motorsport is proud to launch our direct replacement aluminium under tray for the Mk3 Focus ST and RS models. 

The original under tray on this car is notoriously weak due to the fibre material construction and as a result are prone to failure over time.

Our solution to creating a direct replacement under tray in aluminium began with a full 3D scan of the vehicle’s underside to ensure a perfect fitment. As a result, it reuses all original mounting points, as well three additional fittings on the front edge, and is nut and bolted both sides to ensure absolute security. It has also been designed to work with our big boost pipe kit, which fits under the engine.

Unlike any other replacement under tray on the market, our design features no step, which is better suited to lowered cars. The cooling ducts are also larger in size to increase air flow passing over the gearbox and transfer case, which helps to reduce transmission operating temperatures and the sides pieces are larger to create a seal against the arch liners.

Finished in a high-quality black powder coat finish, the under tray offers improved strength, durability and cooling effectiveness.

PLEASE NOTE: The under tray uses existing mounting points and bolts, but it is essential the original plastic fittings the bolts screw into are in good condition. These should only be reused if they still support the bolt properly and you are able to tighten it firmly. If they are worn or broken and offer little to no resistance as you wind the bolt in, they should be replaced with new items from Ford, as failure to do so may cause the under tray to work loose.

The Ford part number for the plastic under tray fittings are as follows:

• W702438-S300 

What does an under tray do?

The under tray has three main purposes: to protect the underside of the vehicle from foreign objects flicking up and causing damage or accelerated wear. Secondly, to improve aerodynamics by creating a low pressure area as air accelerates past its smooth surface. This reduces drag, which works towards improving grip, handling as well as fuel efficiency.

Lastly, on performance models, the under tray often provides increased cooling by either venting cold air to, or extracting warm air from the engine bay. Therefore improving the strength, design, size and cooling effect can offer fantastic benefits.  

Features:

• Direct replacement for original Focus ST and RS Mk3 under tray
• Created from 3D scan and CAD software for perfect fitment
• Made from high-quality aluminium for increased strength
• Uses original mounting points – no cutting or drilling required
• Additional mounting points for absolute security 
• Improved transmission cooling due to larger ducting
• Comes in a durable black powder coat finish

Registered Design Right number: Application Pending

Please note: due to box sizes additional shipping costs may occur for international and EU customers. 

AIRTEC part no: ATMSFO149

We keep a large inventory of stock at our warehouse however due to widespread delays in the industry, some items may be on backorder. If you need parts ASAP then please contact us on the live chat or at support@wayside-performance.co.uk and a member of our team will get back to you.

Unsure on fitment? Just drop us a message on the live chat or support@wayside-performance.co.uk and a member of our team will assist. Please make sure to include as much detail as possible including make, model, registration and the parts you are looking at.