BMW 3 Series F30 F31 Rear Diffuser Gloss/Piano Black Left Single Exit | M Performance Style Rear Bumper Valance Splitter Insert | F30 Saloon F31 Touring 2013–2019 | BLAK by CT Carbon | Left-Side Exhaust Surround Lower Bumper Trim

High-gloss rear valance upgrade for BMW 3 Series F30 and F31 (2013–2019) — left-side single outlet

Refresh the back end of your 3 Series with this premium rear diffuser insert from CT Carbon’s BLAK range. Designed for the F30 Saloon and F31 Touring with a single left-hand tailpipe layout, it delivers a sharper, performance-inspired look with a deep piano black finish that ties in perfectly with shadowline and black styling packs.

• Direct styling enhancement for BMW 3 Series F30 and F31, model years 2013–2019
• Left-side single outlet configuration for cars with a left-hand exhaust exit
• High-shine black finish for an OEM+ appearance and modern sport aesthetic
• Precision-formed for a snug, clean fit and a tidy factory-style install
• Durable surface designed for daily road use and easy maintenance

We’ve fitted this diffuser in-house on customer vehicles and on our own builds. Feedback has been consistently excellent: stand-out looks, great fit, and a serious uplift to the rear profile without going over the top. If you want that performance look at a sensible price, this is the one.

Compatibility

BMW 3 Series F30 (Saloon) and F31 (Touring), 2013–2019, with a single left-hand exhaust layout. Not suitable for dual-exit or right-side systems.

What you get

1 x rear lower diffuser insert in high-gloss black.

Fitting service

Professional installation available at MJ Modifications in Warwickshire. For a fitting quote or to book an appointment, email info@mjmodifications.co.uk.

Why choose this upgrade

• Transforms the rear bumper with a sportier, performance-look design
• Perfect match for blackline, de-chrome, and aero styling packages
• Great for F30/F31 owners seeking a subtle yet aggressive rear diffuser, rear bumper insert, rear splitter, or lower valance replacement
• Ideal search alternatives: F30 rear diffuser, F31 Touring rear valance, rear bumper trim, exhaust surround, lower bumper apron, performance rear splitter, piano black diffuser

Upgrade your BMW’s presence with this sleek rear diffuser insert from CT Carbon’s BLAK range and enjoy a refined, factory-style finish that looks right at home on the 3 Series.