Maxton Design Street Pro Side Skirt Diffusers + Flaps – Audi A5 S line / S5 Coupe & Sportback B9
Give your A5 or S5 a sharper, lower look with Maxton Design Street Pro side skirt diffusers and flaps. They sit beneath the sills to visually lower the car, tidy airflow along the sides, and add a clean motorsport style without going over the top.
Built from 10 mm ABS plastic, these skirts are tough, stable and made for daily use. The UV-coated finish resists fading, with high impact and scratch resistance for extra peace of mind. No painting is required. If you choose to paint, use primer first.
Finish options:
– 10 mm matte black
– 10 mm matte black with a red core accent
Fitment:
Designed for the Audi A5 S line and S5, B9 generation, in Coupe and Sportback body styles. Please use our vehicle lookup or see the Vehicle Fitment tab to confirm exact compatibility for your car.
What you get:
Installation is straightforward for a competent DIYer or professional. Always test-fit before drilling or painting. These parts are temperature and weather resistant, arrive with protective film, and come marked to confirm authenticity.
Safety and quality:
The material carries TUV MATERIALGUTACHTEN certification, confirming the quality of the ABS used. Designed to stay secure when correctly installed and not to interfere with normal vehicle operation.
Benefits you will notice:
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.








