Mercedes-AMG
G63 W463A · 2018 – present
The G-Wagen sounds like a side-exit V8 muscle car the moment you stop letting the ECU hide it.
- Fits W463A G63 with side-pipe valved exhaust
- Compatible with OEM and aftermarket valved systems
- Two-module pair, hidden install
- Fully reversible
Free UK shipping
2-year warranty
Fully reversible
The honest pitch
What this actually does to your G63
The side-exit exhaust on the W463A G63 is theatre. The valve map is not. In Comfort, those gorgeous pipes might as well be ornamental.
Open Valve lets the M177 V8 sing through them all the time. The whole village will know when the school run starts.
Fitment
Mercedes-AMG G63 W463A
Years
2018 – present
Install time
~10 minutes
Tools needed
None
Long read
The Mercedes-AMG G63 valve story
The W463A G63 has one of the most theatrical exhaust systems on any production car — side-exit pipes that run the length of the body, finished in chrome, designed to be seen. The valve map is depressingly conservative. In Comfort, those gorgeous pipes are largely ornamental.
Open Valve pins both rear valves open. The M177 then sings through the side-exit pipes at every throttle position in every mode. The whole village will know when the school run starts.
Two-module install. The actuators sit underneath the rear of the G — workshop fitment via lift recommended.
Install — step by step
- 01
Raise car on lift.
- 02
Locate both side-pipe valve actuators near the rear differential.
- 03
Disconnect each 2-pin connector, plug each module inline.
- 04
Bracket-mount module bodies.
- 05
Refit any displaced trim.
- 06
Pair fob, test on idle — the side-pipe character will be immediately obvious.
In the box
- Two valve override modules (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
- ·W463A G63 (2018+) with factory side-pipe valved exhaust.
- ·Older W463 G63 not compatible with this version.
- ·Aftermarket side-pipes retaining OEM actuators: compatible.
Mercedes-AMG G63 — FAQ
Does it work on W463A only, or older G63 too?+
W463A (2018+) only. Earlier W463 G63 uses different actuator hardware.
What about the G500/G550?+
G500/G550 does not have a valved exhaust from the factory.
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 affect the G63's off-road modes?+
No — Low Range, diff locks and off-road logic are completely independent of the valve.
Is towing affected?+
No — G63 tow rating unchanged.
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.
