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Can someone give me the exact sequence of actions to follow to keep the valves fully open? Many thanks!!
Before proceeding, make sure tailpipes are cooled off.

1. Push start button without pushing the brake pedal. This turns the ignition on, but does not start the engine.
2. Push the exhaust button in the center console and this will open the exhaust valves wide open.
3. Look into the end of the tailpipes with a flash and confirm the valves are in the wide open position.
4. Crawl under the car and disconnect the connector from the exhaust valves. To do this you need to pull back on the Red tab and then push down on the Black tab and slide connector off of the exhaust valves (see pictures in my previous post).
5. Now start the engine.
6. Look into the end of the tailpipes with a flash light and see the valves in the wide open position.
7. Enjoy the louder sound.

Note: With the engine off, I would recommend sealing the connectors and connection on the exhaust valves so they don’t get corroded and securing them away from the tailpipes so they don’t get against the tailpipes.
 

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What causes the need for steps 4-6? What makes the valves partially close again, and when does that partial closure occur?
From what I can tell, the exhaust valves positions is determined by engine RPM and/or throttle position. Example, when idling, mostly shut so you don’t disturb your neighbors.
When throttle is wide open, exhaust valves are wide open, hence the great sound when accelerating hard.
If you don’t do steps 4-6, the exhaust valves will operate like they always have.
By doing steps 1-3 & steps 4-6, the exhaust valves will be in the open position all the time since there is no power to them to make them change.
 

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Hello, All. I was just searching the net about making the exhaust louder and found this thread. I then found another thread that note perhaps an easier way to disconnect the valve connectors from the spare tire area inside the trunk. It‘s on the F-pace forum uk site. I currently have wife’s 2021 F-pace R-dynamic but have an SVR F-pace on order for myself that is coming in the middle of next month. It looks like one can just disconnect the pink plug by the spare wheel to achieve the same effect after doing the accessory mode procedure. This way, one wouldn’t have to be concerned with taping up with electrical tape and temporarily sealing off the connectors under the car. I definitely plan on doing this once mine comes in.

I don’t think there’s any structural difference between the 2020 SVR & the 2021 SVR. The it’s not as loud is Jaguar changed how valves in the tail pipes are positioned via software. Try my suggestion below and let me know your thoughts.

Before proceeding, make sure tailpipes are cooled off.

1. Push start button without pushing the brake pedal. This turns the ignition on, but does not start the engine.
2. Push the exhaust button in the center console and this will open the exhaust valves wide open.
3. Look into the end of the tailpipes with a flash and confirm the valves are in the wide open position.
4. Crawl under the car and disconnect the connector from the exhaust valves. To do this you need to pull back on the Red tab and then push down on the Black tab and slide connector off of the exhaust valves (see pictures in my previous post).
5. Now start the engine.
6. Look into the end of the tailpipes with a flash light and see the valves in the wide open position.
7. Enjoy the louder sound.

Note: With the engine off, I would recommend sealing the connectors and connection on the exhaust valves so they don’t get corroded and securing them away from the tailpipes so they don’t get against the tailpipes.
 
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