Toyota
GR Supra A90 / A91 · 2019 – present
B58 inline-six on full broadcast — the Supra finally sounds like the Z4 it shares the engine with should.
- Fits A90 and A91 Supra 3.0 with valved exhaust
- Compatible with valved aftermarket systems
- Plug-and-play to OEM connector
- Reversible in under a minute
Free UK shipping
2-year warranty
Fully reversible
The honest pitch
What this actually does to your GR Supra
The A90 Supra inherits the B58's brilliant noise and inherits Toyota's conservative valve programming. Sport mode opens the flaps for about four seconds at a time.
Open Valve pins them open whenever you want. Same engine, same exhaust, completely different mood.
Fitment
Toyota GR Supra A90 / A91
Years
2019 – present
Install time
~10 minutes
Tools needed
None
Long read
The Toyota GR Supra valve story
The A90 Supra shares its B58 engine and a lot of its drivetrain with the G20 M340i and the G29 Z4 M40i. It also shares the conservative valve map. Sport mode opens the flap for short windows; everywhere else, the rear valve cycles shut at the slightest excuse.
Open Valve pins the rear flap open. The B58 in the A90 then runs at full Sport voice in every mode. The decel chatter on overrun, the off-cam burble, the turbo flutter on shift — all of it stays present.
Single actuator, single module. Install lives in the boot — about ten minutes.
Install — step by step
- 01
Boot floor up, rear right carpet flap back.
- 02
Disconnect 2-pin connector. Plug module inline.
- 03
Velcro module body to parcel shelf underside.
- 04
Refit carpet, floor.
- 05
Pair fob, test.
In the box
- One valve override module (one per actuator)
- Two-button RF key fob (CR2032 pre-installed, spare in the box)
- OEM-pattern connectors — no cutting, no splicing, no scotch-locks
- Printed install card with model-specific photos and a workshop QR link
Fitment notes
- ·A90 / A91 GR Supra 3.0 (2019+).
- ·2.0 Supra not compatible (no valved exhaust).
- ·Compatible with valved aftermarket systems.
Toyota GR Supra — FAQ
Does it work on A90 and A91?+
Yes — both share actuator hardware.
What about the 2.0 four-cylinder Supra?+
2.0 Supra uses a fixed back-box with no flap — not compatible.
Will it throw a warning light on the dash?+
No. The module sits in the signal path between the ECU and the actuator motor. The ECU sees a normal actuator response back, so there's nothing to flag. We've shipped thousands of these and not had a single check-engine call linked to the module itself.
Is it reversible?+
Yes, fully. Unplug the module, plug the OEM connectors back into each other, refit the trim — about three minutes' work. There's no permanent change to the car, no part cut, nothing in the ECU. Dealer service visits, MOT, sale to a new owner — pull it out and it's like it was never fitted.
Does it work with an aftermarket exhaust?+
If the aftermarket back-box retains the OEM-pattern valve actuators (most do — Akrapovic, Milltek, IPE, Capristo all run the factory motors), yes. If the system is a straight-through with no valves, there's nothing for the module to override.
Will it work with a Stage 1 tune?+
Yes — module is signal-level. Tuned cars sound considerably more aggressive.
Does Toyota TechStream see anything?+
No — module invisible to dealer diagnostics.
Disclaimer
Open Valve modules are intended for off-road and motorsport use only. Please confirm your car has factory valve-actuated exhaust before ordering — if you're not sure, message us first. Professional installation recommended. Use at your own risk.
