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Maxton Design

Maxton Design BMW 1 Series F20 F21 Pre-LCI Rear Diffuser/Valance Insert Kit with Rear Spats & Side Splitters (2011-2015) - Rear Bumper Lip/Skirt Upgrade - Fits M135i & M140i

Maxton Design BMW 1 Series F20 F21 Pre-LCI Rear Diffuser/Valance Insert Kit with Rear Spats & Side Splitters (2011-2015) - Rear Bumper Lip/Skirt Upgrade - Fits M135i & M140i

£149.15
£157.00 £149.15
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BMW 1 Series F20 F21 Pre-LCI Rear Valance Diffuser and Rear Spats Kit by Maxton Design

Give the back end of your 1 Series a serious upgrade with this Maxton Design rear valance diffuser and matching rear spats for the F20 and F21 pre-facelift models. Engineered for the 2011 to 2015 3-door and 5-door hatchback, including the M135i and M140i variants, this aero styling pack delivers an aggressive OEM-plus look with everyday usability.

Made from automotive-grade ABS, the same material commonly used in factory bumpers, this diffuser insert and side extensions offer the ideal blend of strength, flexibility and precise fit. We have installed this kit in-house and customer feedback has been consistently excellent on fitment, finish and the sharper stance it gives the rear of the car.

Why enthusiasts choose this rear aero kit

  • Transforms the rear profile with a wider, lower appearance and performance-led styling.
  • ABS construction for durability on UK roads - robust, lightweight and built for daily use.
  • Designed specifically for F20 F21 pre-LCI chassis for a clean, accurate fit.
  • Works perfectly on M135i and M140i models for a cohesive M Power look.
  • Quick visual win - big aesthetic impact with minimal downtime.

SEO-friendly search terms customers use

BMW 1 Series F20 F21 rear valance, diffuser insert, rear bumper lip, rear skirt, rear spats, rear splitter extensions, hatchback rear aero, F20 5-door diffuser, F21 3-door diffuser, pre-facelift 1er rear styling, M135i M140i rear upgrade, Maxton aero kit, performance body styling for BMW 1er.

Key details

  • Material: High-quality ABS plastic engineered for automotive applications.
  • Fitment: F20 F21 2011 to 2015 pre-LCI, including M135i and M140i.
  • Installation time: around 30 minutes in typical workshop conditions.
  • Finish and fit: Excellent alignment with factory lines for a premium look.

Compatibility

BMW 1 Series F20 and F21 pre-LCI - 2011 to 2015. Compatible with M135i and M140i models.

What you receive

  • Rear valance diffuser
  • Rear side splitters - left and right
  • Mounting hardware

Part number

BM-1-F20-M-CNC-RS1A

Fitting and installation

Professional installation recommended. Estimated install time is approximately 30 minutes.

Want it fitted by specialists? Book with MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk

Pre-dispatch compatibility check

We will verify suitability before shipping. Please provide your UK registration or the last 7 of your VIN at checkout so we can confirm the correct fit for your F20 or F21, including M135i or M140i.

Manufacturer

Maxton Design

If you are searching for a rear bumper lip for 1 Series F20 F21, a BMW 1er rear valance, M135i M140i rear aero, Maxton rear spats, or a pre-LCI diffuser insert, this kit hits the mark for style, quality and fit.

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