Maxton Design Side Skirt Diffusers V.2 – BMW M135i xDrive (F70) M Performance
Give your M135i a sharper, lower look with side skirt diffusers designed to fit like factory parts. 3D scanned for accuracy, they follow the sill line perfectly and add a clean OEM+ finish without fuss.
Fitment
Designed for BMW M135i xDrive (F70) 2024-on with M Performance styling. For full details, use our vehicle lookup or see the Vehicle Fitment tab.
What it does
Extends the side profile for a more planted stance. Helps smooth airflow along the sills at speed. Visual drop without changing suspension.
Material and finish
Made from high-grade ABS plastic used widely by car makers. Lightweight with a little flex to resist cracking. Supplied in gloss black to match modern trims.
In the box
- Left and right side skirt diffusers
- Fitting kit
- Printed fitting manual
Installation and safety
Parts arrive ready to fit with a protective film. Test fit first. Only remove the film once you are sure of fitment. We recommend professional installation if unsure. Incorrect fitting can damage the product or vehicle. Keep the holographic verification sticker intact to maintain return eligibility and prove authenticity.
Certification
TUV MATERIALGUTACHTEN certified for material quality.
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.








