String Theory Garage will be closed to the public from Wednesday, 29th July to Thursday, 6th August for our annual shutdown.
If you need to get in touch, please leave us a voicemail or send an email. Our team will happily get back to you when we return on Friday, 7th August.
Shopping online? Don't worry! Our online store will remain active! We hope to ship orders placed for in-stock items as normal during the shutdown. Anything else will be dealt with upon our return.
Thank you for your understanding, String Theory Garage Team
Elevate the exhaust character of your BMW M140i (F20/F21 LCI) with this Milltek Sport Resonated Cat-Back Exhaust System. Designed for the non-OPF/GPF LCI M140i, this system replaces the entire cat-back section with Milltek Sport stainless steel pipework, delivering a richer, more composed exhaust note with improved tonality across the rev range.
The resonated design keeps road noise at a comfortable level whilst providing a clearly improved exhaust sound — making this the ideal choice for drivers who want a better-sounding car without sacrificing comfort on long motorway journeys. Available in five tip finish options. No ECU remap required. Made at Milltek Sport's Derby factory in the UK.
Fitment: BMW M140i F20 & F21 LCI (Non-OPF models)
E-marked: EC approved
Tip options: Polished, Cerakote Black, Titanium, Burnt Titanium, Carbon Fibre
