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
The BMW F80 M3 has one of the finest exhaust notes of any modern performance saloon, and this Milltek Sport Cat-Back Exhaust System makes the most of it. Designed for non-OPF/GPF F80 M3 models, this EC-approved system replaces the full cat-back section with high-quality 304L stainless steel pipework, delivering a refined yet noticeably more intense exhaust note across the entire rev range of the S55 twin-turbocharged inline-six.
The system is engineered to work with the OEM catalysts and downpipe, making it a genuine performance upgrade without requiring any additional modifications. A direct bolt-on fitment with no cutting or welding. Available in four tip finish options. No ECU remap required, though this system works perfectly in conjunction with a Stage 2 tune. Made at Milltek Sport's UK factory.
Fitment: BMW M3 F80 (Non-OPF/GPF models) 2014–2018
E-marked: Yes (EC approved)
Tip options: Polished, Cerakote Black, Titanium, Carbon Fibre
