Audi
RS5 B9 · 2017 – present
Free up the 2.9 TFSI V6's twin-turbo grunt — coupé, sportback and TT-RS owners all benefit.
- Fits B9 RS5 coupé and sportback
- Two-module kit, one per actuator
- Cabin fob control, no rewiring
- Reversible in under five minutes
Free UK shipping
2-year warranty
Fully reversible
The honest pitch
What this actually does to your RS5
The B9 is muted from the factory in a way the B8 V8 never was. That's emissions reality, not laziness, but it means the 2.9 sits on top of a far more interesting exhaust note than you ever hear at the wheel.
Pop the valves open and the V6 wakes up a couple of decibels in the midrange and a lot of decibels on overrun. The flutter on lift is the bit most owners hear first and immediately grin at.
Fitment
Audi RS5 B9
Years
2017 – present
Install time
~10 minutes
Tools needed
None
Long read
The Audi RS5 valve story
The B9 RS5 sits in an awkward place in the Audi range — too quiet to please owners coming from the B8 V8, too expensive to be the bargain hot saloon, and saddled with a 2.9 TFSI V6 that has plenty to say once you let it. The valve map on the OEM exhaust is the conservative one most of the RS line wears.
Both Coupé and Sportback B9 RS5 share the same actuator hardware, the same connector and the same install location. Open Valve holds both rear valves open whenever you ask it to. The 2.9 — a twin-turbo V6 derived from Porsche's Panamera engine — wakes up around 2,800 RPM and stays vocal all the way to the limiter.
The party piece on the V6 cars is the decel pop. The factory map suppresses it in everything but Sport+ above 4,000. With the flaps held open, you get the snap-crackle every lift, every gear change, every roundabout exit. It's the bit most B9 owners hear first and immediately grin at.
Fitment time on the B9: about fifteen minutes. Boot floor up, locate both actuators near the rear silencer, plug in inline. We've fitted these in Audi dealer car parks while owners had a coffee. No tools beyond a trim wedge.
Install — step by step
- 01
Open the boot, lift the floor and the styrofoam tray.
- 02
Pull back the carpet over the rear silencer — both 2-pin grey actuator connectors are visible from above.
- 03
Disconnect each, plug the module inline (keyed connectors — only goes in one way).
- 04
Velcro both module bodies to the underside of the parcel shelf, away from the silencer heat.
- 05
Refit carpet, tray, boot floor.
- 06
Pair fob, test — both flaps should click open audibly.
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
- ·B9 RS5 Coupé and B9 RS5 Sportback — same kit.
- ·Pre-facelift (2017–2019) and facelift (2020–present) share the same actuator and pinout.
- ·Not compatible with cars converted to straight-through systems with no flaps.
Audi RS5 — FAQ
Does it fit the RS5 Sportback as well as the Coupé?+
Yes — both B9 body styles share the same exhaust valve hardware and install procedure.
Will it work with an aftermarket Capristo or Milltek back-box?+
Yes, provided the aftermarket back-box uses the OEM actuator motors (they almost all do). The connector is identical.
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.
Is there any effect on the RS dynamic exhaust button on the centre console?+
The console button toggles between the OEM map states. With the module ON, the button still works — but both states will sound louder because the rear flaps are pinned open regardless. With the module OFF, the button behaves exactly as factory.
Will the dealer service log show anything?+
No. There is no fault code generated and no entry in any service log. The module is electrically transparent to OBD scans.
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.
