Scorpion Valved GPF/OPF-Back Exhaust for BMW 1 Series 128ti F40 (2021) – Active/Switchable Back Box Axle-Back, 70mm, Daytona 114mm Tips – Performance Rear Section – Part SBM085

Give your BMW 1 Series 128ti F40 an addictive soundtrack and a sharper driving feel with this valve-controlled GPF-back rear exhaust, part number SBM085. Perfect for the 2021 128ti, it unlocks a deeper, richer tone while keeping the particulate filter untouched, making it a smart, road-friendly performance upgrade for your hot hatch.

We have fitted this system on customer cars and the feedback has been fantastic. Owners love the refined cabin manners with the valve closed and the invigorating, sporty note when it is open. It looks the part, sounds the part and delivers real weight savings you can feel.

• Electronically actuated valve for switchable sound on demand
• Free-flowing 70 mm pipework for improved exhaust efficiency
• Daytona 114 mm tailpipes for a purposeful, motorsport-inspired finish
• Substantial weight saving versus stock, from 17.2 kg down to 11.45 kg, a reduction of approximately 5.75 kg
• GPF-back layout for a straightforward upgrade that leaves emissions hardware in place
• Compatible with factory components as well as matching aftermarket sections
• Designed for precise fitment on the BMW 128ti F40, 2021 model year

Whether you call it a valved back box, rear section, or GPF-back upgrade, this UK performance exhaust delivers the sound and style your 128ti deserves. Expect crisper response, a richer tone under load and an elegant look thanks to the Daytona 114 mm tips. With the valve closed, it remains civil for daily use. Open it up and enjoy a more engaging, track-inspired character.

Technical details

• Part number: SBM085
• Layout: GPF-back, rear exhaust section with electronically controlled valve
• Pipe diameter: 70 mm
• Tailpipe style: Daytona 114 mm
• OE weight: 17.2 kg
• System weight: 11.45 kg
• Fitment compatibility: OEM and matching aftermarket components

Shopping for a BMW 128ti exhaust upgrade in the UK? This is the ideal F40 1 Series performance exhaust for drivers who want a valved GPF-back system, enhanced sound, lighter weight and premium aesthetics. Great for spirited road use and weekend adventures.

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