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
Transform the exhaust note of your Toyota GR Yaris Gen 1 with this Milltek Sport Resonated OPF/GPF Filter-Back System. Engineered specifically for the 1.6T turbocharged three-cylinder, this ECE-approved system replaces the factory particulate filter-back section with a free-flowing 76mm (3") stainless steel system that delivers a noticeably improved exhaust note whilst retaining everyday refinement.
The resonated design uses an internal baffle to smooth out drone and harshness at motorway speeds, making this the ideal daily driver upgrade. You get all the character and improved sound of a performance exhaust without the discomfort of a non-resonated system on longer journeys. Available in five tip finishes to suit your GR Yaris's colour and style.
Designed as a direct bolt-on replacement for the OEM exhaust — no cutting, welding, or modifications required. ECU remapping is not required for this system, though it can complement a Stage 1 tune. Manufactured from 304L aircraft-grade stainless steel at Milltek Sport's Derby factory.
Fitment: Toyota GR Yaris & GR Yaris Circuit Pack 1.6T (OPF/GPF Models Only) 2020–2024
