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 Milltek Sport Hollowtek Twin-Valved Exhaust System for BMW M2 F87 is a true flagship exhaust upgrade — combining the versatility of an electronically controlled twin-valve system with Milltek Sport's acclaimed UK-manufactured quality. The Hollowtek valve mechanism allows you to switch seamlessly between a quieter, road-friendly mode and a full, unleashed exhaust note at the touch of a button, making this system the perfect daily driver and track day companion.
EC-approved and engineered as a direct OEM replacement for the M2 F87, this system features Milltek Sport's proprietary Hollowtek design for outstanding sound quality. Available in five tip finishes to complement the aggressive styling of the M2. Works with existing downpipe and catalysts — no ECU remap required. Manufactured from 304L stainless steel in the UK.
Fitment: BMW M2 F87
E-marked: Yes (EC approved)
Tip options: Polished, Cerakote Black, Titanium, Burnt Titanium, Carbon Fibre
