AIRTEC Aluminium Engine Undertray - Ford Focus RS MK3
AIRTEC Aluminium Engine Undertray - Ford Focus RS MK3
AIRTEC Motorsport are proud to launch their direct replacement aluminium undertray for the Mk3 Focus RS. The original undertray becomes notoriously weak due to the fibre material construction and are prone to failure over time.
AIRTEC's solution to creating a direct replacement undertray 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.
Unlike any other replacement undertray on the market, AIRTEC's 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 undertray offers improved strength, durability and cooling effectiveness.
PLEASE NOTE: The undertray 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 undertray to work loose.
The Ford part number for the plastic undertray fittings are as follows:
- W702438-S300
Features:
- Direct replacement for original Focus RS Mk3 undertray
- 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
UK DELIVERY & STOCK INFORMATION
We hold one of the most extensive ranges of performance parts in the UK through our trusted supplier network. Most in-stock items are dispatched the same working day when ordered before 2PM.
If something isn’t currently in stock, it’s usually unavailable anywhere else - but we’ll always do our best to source it quickly and keep you updated.
Keep an eye on the stock status shown on each product - this provides an accurate guide to availability and lead times. On rare occasions, supplier updates may cause small variations in delivery times.
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RETURNS & WARRANTY
We always aim to make sure you’re happy with your order, and our team is here to help if there’s ever an issue.
Unused items can be returned within 14 days of delivery for a refund or exchange, provided they’re in original packaging and resellable condition.
Some products may be subject to a restocking or processing fee, and custom or made-to-order items (such as brake lines, custom colours, or special builds) can’t be cancelled or refunded once production begins.
If you’re unsure whether your item is custom, please contact us before ordering.
Most products include a 12-month manufacturer warranty, and we’ll always help guide you through the process if something goes wrong.
For full details, please see our Returns Policy.
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- Over 10 Years Experience