Maxton Design Side Skirt Diffusers for BMW M5 G90 Saloon and G99 Touring
Add a sharper, lower look to your M5 while subtly smoothing airflow along the sills. These side skirt diffusers are designed to complement the factory body lines and give a clean OEM+ finish without fuss.
Made from durable ABS plastic in gloss black, they are lightweight with a little flex to resist knocks from daily use. ABS is widely used in car exteriors for its impact and weather resistance. Each piece is 3D scanned for precise fitment on the M5, so the contours follow the car closely.
Fits:
– BMW M5 G90 Saloon 2024-on
– BMW M5 G99 Touring 2024-on
Use our vehicle lookup or check the Vehicle Fitment tab to confirm compatibility with your car.
Installation is straightforward using the supplied hardware and fitting manual. We recommend professional fitting if you are not confident. Ensure all fasteners are secure and recheck after initial miles.
Whats included:
- Left and right side skirt diffusers
- Fitting kit
- Fitting manual
Finish and certification:
– Gloss black surface, ready to fit with no extra prep required.
– TUV MATERIALGUTACHTEN certified material.
Important information:
The product arrives with a protective film. Only remove it once you are sure the part fits your vehicle, as removal will void returns. Please compare your car to the listing title and images before installation. Keep the holographic verification sticker attached to retain return eligibility and authenticate the part as genuine Maxton Design. We cannot be responsible for incorrect installation or use.
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.









