Maxton Design Rear Diffuser and Milltek GPF/OPF Back Exhaust System for Ford Fiesta MK8 ST & MK8.5 ST (2018-2022)
Enhance the style of your Ford Fiesta MK8 ST and MK8.5 ST (2018-2022) with the Maxton Design Rear Diffuser and Milltek GPF/OPF Back Exhaust System. This complete set is designed to provide a sleek and modern look to your vehicle.
Compatibility
- Ford Fiesta ST Mk8 until September 2020
Complete Set Contains
- Rear diffuser
- Milltek GPF/OPF back exhaust system
Milltek Exhaust System
Every Milltek system is crafted in the UK using aerospace-grade type 304, non-magnetic stainless steel, ensuring durability and resistance to discolouration. The mandrel bending process guarantees optimised gas flow, while the enlarged bore diameters enhance performance without sacrificing mid-range torque. The exhaust systems undergo extensive acoustic development to deliver a sporty and crisp tone without causing NVH, drone, or cabin resonance.
The systems feature a 2.76-inch (70mm) tube, with available downpipes to remove the OPF with or without Hi Flow Sports Cats. Pre-September systems require re-use of the OEM Valve actuator, while post-September models include the correct actuator. An Active Valve Control is available for complete control over valve positions. The OPF-Back System is EC Approved.
Rear Diffuser Description
This product serves as a replacement for the original diffuser, adding aesthetic value to your vehicle. Made from ABS plastic, it is lightweight and offers some flexibility. The diffuser is available in three surface options: textured, gloss black, and carbon look.
Additional Information
- No additional work is required to finish the product.
- The product arrives with a protective film; removal voids returns.
- Ensure correct fitment by comparing the vehicle in the listing photos and title to your own.
- Professional installation is recommended unless you are confident with the fitting manual.
- This product is TUV MATERIALGUTACHTEN certified.
- Removal of the holographic verification sticker voids returns and identifies the item as an authentic Maxton Design product.
Choosing a Kit
Our vehicle registration lookup system cannot detect factory trim level. It is important for customers to check the specification of their own vehicle against the product description, and if their vehicle has an existing sports trim level, body kit or factory enhancement that may cause it to look different from other similar models.
For example: Volkswagen R-Line, BMW M-Power/M-Pack, Audi S-Line, Ford ST-Line, Merc AMG-Line, Seat FR.
These kits will not fit models that don't meet these specifications.
Returns
Purchased the incorrect kit for your vehicle? Or not sure you like the surface finish when it arrives? No problem!
Maxton Design products are eligible for return if the product has not been fitted, drilled, modified or damaged in any other way and still has the protective factory film intact. Unfortunately, there are no exceptions, this applies to fully removed and partially removed films.
Products with a protective film in place are clearly marked with this sticker, if you believe there to be an issue with the product but you can't tell without removing the film, please contact our support team directly for assistance.
DO NOT REMOVE THE FACTORY FILM UNTIL YOU'VE LINED IT UP, AND YOU'RE READY TO FIT THE PART.
See our Terms & Conditions for more information.
Installation & Fitting
Instructions & Guides
Maxton Design provide either an online reference (below) or printed instructions with their products, we can't stress enough how important it is to follow these guidelines. Not only does this create a safe, aesthetically well fitted product, but it increases the longevity and lifespan of the kit.
Neither Progressive Parts nor Maxton Design will be able to provide and support or warranty for products fitted incorrectly. For example, front splitters require the front bumper to be removed, without doing so the bolts will be incorrectly positioned and may not be able to cope with the down-force exerted on it. Straying from the guidelines in this manner must be done so at the owners risk.
Fibreglass & "Non-Prepped" Products
By adding these products to your basket you are agreeing to the below statement.
All Maxton Design Fibreglass products including certain bumpers, spoilers, spoiler extensions and skirts will require “prep” before installing.
These are not a simple 'ready to fit' modification. In transit, the items may get chipped or marked and as such prior to painting it is important you understand that the parts may require filling, sanding and repairing (defined "prep") prior to paint being applied, which can be undertaken by any reputable body shop at minimal cost.
Return requests based on not anticipating the definition above are not accepted, please be aware you have agreed to this statement and the definition of “prep” work required prior to purchasing.
Product images shown for sale often indicate a finished product, the colour shown on the vehicle is for illustration purposes.
Fitting Manuals
Please note, Maxton Design products are only available for UK shipping.
Including Northern Ireland, Scottish Highlands and Channel Isles. Delivery fees apply.













