Performance M
Maxton Design Racing Side Skirts Diffusers/Extensions for BMW 1 Series F21 3-Door M135i/M140i M Sport (M-Pack) 2011-2019
Maxton Design Racing Side Skirts Diffusers/Extensions for BMW 1 Series F21 3-Door M135i/M140i M Sport (M-Pack) 2011-2019
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Racing Sill Extensions by Maxton Design for BMW F21 3dr M135i and M140i with M Sport styling, 2011 to 2019
Give your F21 three door a sharper, road-hugging profile with Maxton Design racing sill extensions. These aero side blades run the full length of the rocker panels to deliver a lower, wider look that ties in perfectly with factory M Sport bumpers. Manufactured from automotive ABS and supplied with a fitting kit, this upgrade brings an aggressive, OEM plus finish that looks at home on daily drivers and track toys alike.
Compatible vehicles
- BMW 1 Series F21 3 door with M Sport package
- M135i and M140i models
- Model years 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
What you receive
- Maxton Design racing sill extensions
- Mounting hardware
Why enthusiasts choose this kit
- Perfectly tailored for the F21 M Sport bodywork for a seamless, factory style appearance
- Transforms stance with a more purposeful, track inspired side profile
- ABS construction for strength, impact resistance and everyday durability
- TUV MATERIALGUTACHTEN certified material for reassurance
- Straightforward installation with the supplied fixings
- Designed by Maxton Design to complement OEM lines on M135i and M140i
Material and build quality
Produced from automotive grade ABS, the same type of material used widely for factory exterior trim, these side blades balance rigidity with flexibility for real world use. The material is TUV MATERIALGUTACHTEN certified, so you can buy with confidence knowing quality standards are met.
Fitting service
Professional installation is recommended. For expert fitting, choose MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk.
Proven with customers and on our own cars
We run Maxton aero on our builds and our customers consistently praise the fit, finish and the way these sill extensions complete the M Sport look on the F21 M135i and M140i.
Search friendly terms customers use
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