Performance M
Maxton Design Street Pro Rear Bumper Diffuser & Lower Valance for BMW 3 Series G20 Saloon/Sedan (2018+) – Rear Splitter Insert, Rear Apron Lip, Lower Insert/Undertray – Matte Black or Matte Black Red Core
Maxton Design Street Pro Rear Bumper Diffuser & Lower Valance for BMW 3 Series G20 Saloon/Sedan (2018+) – Rear Splitter Insert, Rear Apron Lip, Lower Insert/Undertray – Matte Black or Matte Black Red Core
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Maxton Design Street Pro Lower Rear Valance for BMW 3 Series G20 Saloon 2018 onward
Give your G20 saloon the punchy, motorsport-inspired rear end it deserves with this premium Street Pro lower diffuser insert from Maxton Design. Crafted for enthusiasts who want sharper styling and dependable build quality, this rear underbody spoiler adds a purposeful, track-ready look while remaining perfectly suited to daily driving in UK conditions. If you are shopping for a G20 rear splitter insert, rear valance panel, rear apron, or an OEM-plus body kit upgrade for the BMW 3 Series saloon, this is the go-to choice.
Fitment
Compatible with: BMW 3 Series G20 Saloon 2018 onward
Why this Street Pro rear insert is a brilliant upgrade
- Heavy-duty 10 mm ABS construction for superb rigidity and long-term durability
- Excellent impact and scratch resistance for real-world road use
- UV-stabilised surface to help resist fading and discolouration
- Temperature and weather resistant material designed for year-round British roads
- Supplied ready to fit with protective film - no painting required
- Genuine item with authenticity labelling
- TUV MATERIALGUTACHTEN certified material for added confidence
Finish options
- 10 mm matte black
- 10 mm matte black with red core accent
What you receive
- Maxton Design Street Pro rear lower panel
- Mounting hardware kit
Style and presence that suits the 3 Series
This rear lower diffuser panel integrates cleanly with the G20 saloon’s lines, sharpening the stance and complementing performance exhaust systems and other aero pieces. The result is a crisp, aggressive look that feels factory-plus rather than overdone. We have installed this item on customer cars and our own build vehicles, and feedback on fit, finish, and the visual transformation has been consistently excellent.
Installation and support
Professional fitting recommended. For expert installation, choose MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.
Good to know
- If you plan to paint, apply a suitable primer first
- Product is vacuum-sealed and supplied with protective film
Popular search terms
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Order your genuine Maxton Design Street Pro rear insert today from MJ Modifications and elevate the rear profile of your BMW 3 Series G20 with confidence.
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