Scorpion Valved GPF Back Exhaust for BMW 128ti F40 2021+ - Rear Section Backbox Rear Silencer Axle Back Muffler, 70mm Bore, Twin 114mm Ascari Tips - Electronic Valve Control Sports Exhaust, BMW 1 Series F40 - Part SBM085CF

Transform the character of your BMW 1 Series hot hatch with a premium rear exhaust upgrade tailored to the 128ti on the F40 platform, 2021 onwards. This valved rear section delivers a deeper, sportier tone when you want excitement and refined cruising when you do not. It is the perfect sound and style enhancement for daily driving and weekend blasts.

We have fitted this system for customers and on our own cars. The feedback is consistently positive for build quality, fit and the way it elevates the soundtrack without drone. If you are searching for a BMW 128ti F40 exhaust upgrade, valved sports exhaust, rear silencer replacement, backbox with valve control or a GPF back performance exhaust, this is the one to have.

• Application: BMW 128ti F40, 2021 onwards
• Layout: GPF back rear section with electronically controlled valve for adjustable sound
• Bore size: 70 mm tube for freer flow compared with standard pipework
• Tailpipe style: Ascari 114 mm twin outlets for a purposeful OEM plus look
• Weight saving: factory system 17.2 kg vs this system 11.45 kg, a reduction of 5.75 kg
• Part number: SBM085CF
• Compatibility: designed to interface with original equipment mounting points and associated hardware

Why choose this upgrade

• Switchable tone thanks to the electronically actuated valve. Enjoy a refined commute or open it up for a more aggressive exhaust note.
• Lighter than stock for a tangible reduction in rear end mass which is great for response and agility.
• Large 114 mm Ascari tips fill the rear valance and sharpen the appearance without looking out of place.
• 70 mm pipework supports improved gas flow for a more engaging drive.

Popular search terms we see for this product include BMW 128ti F40 exhaust, valved backbox, rear silencer upgrade, performance rear section, sports exhaust for 128ti, GPF back BMW 1 Series, Ascari tips 114 mm, 70 mm bore exhaust and adjustable valve exhaust for BMW 128ti.

Fitting and support

Want it installed professionally. Book in with MJ Modifications in Warwickshire for expert fitting and advice. Request a quote at info@mjmodifications.co.uk.

Key specs at a glance

• Vehicle: BMW 128ti F40 2021+
• System: GPF back rear exhaust, electronically valved
• Bore: 70 mm
• Tailpipes: Ascari 114 mm
• Mass: OE 17.2 kg, system 11.45 kg
• Part number: SBM085CF

Upgrade the soundtrack, sharpen the look and drop weight in one go. Order your BMW 128ti F40 rear exhaust upgrade today.