Rear skirt apron/diffuser for the BMW 4 Series (F32/F33/F36). Fits BMW 428i (since 2008 production) and BMW 435i. Polyurethane (PU/PUR) construction for flexible fitment and long-term durability. Includes integrated mesh inserts, mounting screws, and complete installation hardware. Delivered non-lacquered and ready for painting to match your vehicle's body color, or can be installed in the raw PU finish for a sport diffuser contrast look. This lower rear apron diffuser enhances the rear visual aesthetic of the 4 Series, adding a more aggressive lower profile and improved airflow management at the rear bumper. Manufactured to OEM-equivalent fitment tolerances for seamless integration with the factory rear bumper. Includes Installation Guide. Technical Highlights: Polyurethane (PU/PUR) Construction Includes Mesh Inserts and Mounting Hardware Non-Lacquered — Ready for Paint or Primer Fits: BMW 428i (F32/F33/F36) BMW 435i (F32/F33/F36)