Performance M
Maxton Design Gloss Piano Black Rear Diffuser Insert/Valance/Apron/Bumper Lip with Vertical Fins for BMW 1 Series F20 F21 M Sport M-Power 2011-2017 (Pre-LCI/LCI) ABS Lower Splitter Undertray
Maxton Design Gloss Piano Black Rear Diffuser Insert/Valance/Apron/Bumper Lip with Vertical Fins for BMW 1 Series F20 F21 M Sport M-Power 2011-2017 (Pre-LCI/LCI) ABS Lower Splitter Undertray
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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Gloss Black Rear Diffuser Insert with Vertical Fins for BMW 1 Series F20 F21 M-Power 2011 to 2017
Give the back end of your BMW fresh, motorsport-inspired presence with this Maxton Design lower bumper extension in high gloss black. Engineered for the BMW 1 Series F20 and F21 M-Power models from 2011 to 2017, this rear valance add-on features aggressive vertical fins for a cleaner, wider look and a premium OEM plus finish.
Looking for a BMW 1 Series rear diffuser insert, rear skirt, bumper lip, rear apron, undertray, or lower splitter for F20 or F21? This Maxton Design aero piece is the perfect styling upgrade for a sharper stance and cohesive rear profile without compromising everyday usability.
Why owners choose it
- High gloss piano black surface that complements factory trim and other exterior upgrades
- Vertical fins add a bold, performance-oriented look that enhances the rear bumper lines
- Precisely profiled for F20 and F21 M-Power fitment across both pre-facelift and LCI years 2011 to 2017
- Manufactured from durable ABS for strength, flexibility and impact resistance
- TUV MATERIALGUTACHTEN certified material for quality and safety
- Includes mounting kit and fitting guide for a straightforward installation
- Optional self-assembly stripe in red or white available on request. Dispatched without stripes by default
Real-world results
We use these on our own builds at MJ Modifications and have installed them for many customers. Feedback on alignment, finish and overall look has been consistently excellent, delivering that sought-after OEM plus styling upgrade.
Compatibility
- BMW 1 Series F20 and F21 M-Power
- Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017
What you receive
- Rear diffuser insert with vertical fins
- Mounting hardware
- Fitting manual
- Optional red or white stripe for self-assembly on request
Material and finish
- Automotive-grade ABS plastic
- Finish options from the manufacturer include textured, gloss black and carbon look
- This listing is for gloss black
Fitting and support
Professional installation recommended for best alignment and panel gap consistency. MJ Modifications offers fitting at our workshop in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.
Search-friendly terms
BMW 1 Series F20 rear diffuser insert, BMW F21 rear valance, BMW 1 Series rear skirt gloss black, F20 F21 rear bumper lip, BMW 1 Series lower splitter fins, BMW F20 rear apron, BMW F21 rear undertray, F20 F21 aero diffuser upgrade, BMW 1 Series hatchback diffuser fins, Maxton Design rear valance F20 F21.
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