2014-2020 BMW 4 Series Coupe Aero Function Fiberglass AF-1 Wide Body Rear Add On Spat Extension

2014-2020 BMW 4 Series Coupe Aero Function Fiberglass AF-1 Wide Body Rear Add On Spat Extension

+ $129.00 Shipping
Part# 113588
Availability: Out Of Stock
Processing Time Ships in 1-2 days
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Rear Add Ons by Aero Function. Add visual interest to the rear fascia of your vehicle with the dynamic contours and sharp styling of the Rear Add-On Spoiler. It mounts on the lower section of your rear bumper cover. Advanced design and materials ensure durability and resistance to cracking or deterioration. Painting is recommended before installation. Installation typically requires sanding, trimming, and filling prior to painting, thus, professional installation is recommended.


  • Adds more aggressive style to your vehicle's rear fascia without reducing ground clearance
  • Advanced design and materials ensure tight tolerances and resistance to chipping, warping, or deterioration
  • Specifically designed to fit the contours of your make and model vehicle
  • Requires painting prior to installation
  • 3-year manufacturer warranty

While ground-scraping air dams look great on the rear of your vehicle, their close proximity to the pavement often leads to them becoming damaged on steep driveways and uneven terrain. If the areas you travel make it impossible to keep a low rear air dam intact on your vehicle, the Rear Add-On Spoiler from Aero Function adds visual interest with classy style that does not require any loss of ground clearance. Once the Add-On Spoiler pieces are mounted to the lower part of your rear bumper cover, the specially designed contours serve a double purpose of directing air to improve aerodynamics and reduce overall drag. All parts are delivered ready to paint, and should you wish to match your vehicle's body color we recommend paintwork before final installation.

Advanced computer aided design and high-tech manufacturing processes ensure all Aero Function components fit evenly against every panel and contour of your specific make and model. Once parts have been prepped and installed on your vehicle, they achieve a look that matches the quality of original equipment without the gaps, uneven edges, and poor visual continuity that plague parts from inferior competitors. Depending on vehicle application, components may be produced from carbon fiber plastics, fiberglass composites, or polyurethane polymers. Aero Function is well-respected throughout the industry for the development of each of these lightweight composite materials which feature extremely high levels of strength, rigidity, and superior impact absorption. Even under the harshest climates and conditions, Aero Function parts have proven their ability to maintain integrity without warping or cracking for long periods of time. Add-on aero pieces can be installed using any method of your choice such as double-sided tape or weather stripping adhesive, and Aero Function backs what they build with a 3-year warranty against defects.

Part Notes

  • Must be used with Couture M4 Look Rear Bumper


  • Material FRP (Fiberglass Reinforced Plastics)
  • Style AF-1
  • Type Rear Lip/Add On
  • Quantity Sold 2 Piece

Fitment Guide

Aero Function 113588 fits the following vehicles:

2014-2020BMW4 SeriesCoupe

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