Maxton Design Full Body Kit Pre-preg Carbon Fibre – BMW 1 Series (F40) M Sport / M135i
Give your F40 a sharper, more purposeful look with genuine pre-preg carbon fibre parts that are light, strong, and built to last. Each piece is hand layered using 245 g 2×2 twill weave, set at 90 degrees for consistent strength, then cured under high pressure to deliver a precise fit and clean finish.
Designed for the BMW 1 Series F40 M Sport and M135i from 2019-2023. Use our vehicle lookup to confirm compatibility, or check the Vehicle Fitment tab for full details. For M135i models, the original rear valance must be removed to fit the diffuser.
This kit includes a front splitter, side skirts, rear side splitters, a rear diffuser, and a tailgate spoiler. Together they refine airflow, add subtle stability at speed, and reduce visual height for a lower, more aggressive stance without adding unnecessary weight.
Pre-preg carbon fibre uses a precise resin-to-fibre mix for high strength-to-weight and excellent surface quality. It resists flex and helps maintain performance by keeping weight down.
Installation should be carried out carefully, ideally by a professional. Check ride height and approach angles after fitting, and ensure all fasteners are tightened and rechecked over time. Avoid blocking sensors or tow points.
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.





























