ProTuning BMW 4 Series F32 F33 F36 M Sport Dual Exit Rear Bumper Diffuser (2013-2021) Fits Coupe, Convertible & Gran Coupe - 330i 335i 340i

ProTuning Twin Outlet Rear Diffuser Insert for BMW F32 F33 F36 M Sport

Give the back end of your 4 Series a serious upgrade with this ProTuning twin outlet rear valance. Engineered specifically for the F32 Coupe, F33 Convertible and F36 Gran Coupe equipped with the M Sport rear bumper, this rear lower diffuser insert delivers a clean OEM plus look with a motorsport edge. Designed for a two tailpipe layout left and right, it’s the ideal choice for owners wanting a premium ABS replacement that follows factory body lines and elevates the stance.

At MJ Modifications we’ve installed this part on customer cars and our own builds. Fitment, panel alignment and finish are consistently excellent, and feedback from clients has been outstanding for both quality and appearance. If you’re searching for a BMW F32 rear valance, BMW F33 rear splitter, or BMW F36 twin exit diffuser to suit 330i, 335i or 340i style exhausts, this ProTuning unit is a standout option.

Why enthusiasts choose this upgrade

• Purpose-built for the M Sport rear bumper on F32 F33 F36 platforms for a factory-style integration
• Twin outlet O O design for a balanced, performance-inspired rear end
• High grade ABS plastic that is durable, lightweight and ready to paint if desired
• Straightforward install for competent DIYers or professional fitting
• OEM plus styling that sharpens the rear profile without looking overdone

Key details

• Material: ABS plastic
• Finish: Supplied ready to fit and suitable for painting to match your colour scheme
• Outlet configuration: Dual exit O O
• Fitment: M Sport rear bumper only

Vehicle compatibility

BMW 4 Series with M Sport rear bumper:

• F32 Coupe Pre LCI 2013 to 2017
• F32 Coupe LCI 2017 to 2021
• F33 Convertible Pre LCI 2013 to 2017
• F33 Convertible LCI 2017 to 2021
• F36 Gran Coupe Pre LCI 2013 to 2017
• F36 Gran Coupe LCI 2017 to 2021

Popular search terms this product meets include BMW F32 diffuser, BMW F33 rear valance, BMW F36 twin outlet diffuser, M Sport rear splitter, rear bumper insert for 330i 335i 340i, dual tailpipe conversion diffuser and 4 Series rear lower diffuser UK.

Part number

B1245259

Fitting service

Want it fitted perfectly First time We can help. MJ Modifications offers professional installation in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Compatibility check before dispatch

We’ll verify fitment prior to shipping. Add your UK registration or the last 7 digits of your VIN at checkout so our team can confirm this diffuser suits your specific F32 F33 or F36 with the M Sport rear bumper.

What our customers say

Owners love the flush fit, tight gaps and premium feel. This ProTuning rear diffuser has become a go-to upgrade for those searching for a BMW 4 Series rear splitter, twin exit rear valance, performance rear bumper insert or dual outlet diffuser that looks factory and transforms the rear view.