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
Unleash the full acoustic potential of your Toyota GR Yaris Gen 1 with this Milltek Sport Non-Resonated OPF/GPF Filter-Back System. Removing the factory resonator gives this system a louder, more aggressive exhaust note that truly reflects the GR Yaris's motorsport DNA. Constructed from 76mm (3") diameter stainless steel tubing, this system significantly reduces back pressure through the OPF/GPF section for improved exhaust gas evacuation.
The non-resonated design produces a full, characterful exhaust tone that's particularly impressive under acceleration. For enthusiast drivers who want the most dramatic sound improvement without touching the OPF/GPF itself, this is the definitive choice. Available in five tip finishes to perfectly complement your GR Yaris.
A direct bolt-on replacement for the factory exhaust — no cutting, welding, or ECU remapping required. An optional remap will further maximise performance, but this system transforms the sound and feel of the car straight out of the box. Manufactured from 304L aircraft-grade stainless steel at Milltek Sport's UK factory.
Fitment: Toyota GR Yaris & GR Yaris Circuit Pack 1.6T (OPF/GPF Models Only) 2020–2024
