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
An upgraded diverter valve (blow-off valve) for the Toyota GR Yaris Gen 1 — the Turbosmart Kompact EM PlumBack is a direct plug-and-play replacement for the OEM valve, delivering faster boost response, improved turbo spool, and greater reliability under repeated hard use.
The OEM diverter valve on the G16E-GTS is a known weak point under sustained boost, particularly after an ECU map. This is the most popular direct upgrade — it fits without cutting or fabrication, uses the original wiring connector, and is ready to use straight from the box.
Key features
Direct OEM plug-and-play replacement — no cutting or fabrication
Plumb-back (recirculating) design — emissions legal for road use
Faster boost response and improved throttle feel
Compatible with standard and mapped G16E-GTS engines
Turbosmart billet aluminium construction
Retains OEM wiring connector (EM = Electronic Match)
Fitment
Make: Toyota
Model: GR Yaris
Generation: Gen 1
Engine: G16E-GTS 1.6T
Year range: 2020–2024
Variants: All
What's included
1x Turbosmart Kompact EM PlumBack diverter valve
Fitting hardware and instructions
Installation
Difficulty: DIY friendly. Plug-and-play replacement — no specialist tools required. Approximately 30 minutes.
