[Lithias]

Originally Posted by chevymaro

The valves are open when I’m idling, they don’t close. The difference between open and closed is pretty substantial and even if I sit in park and shuffle through the drive modes the exhaust note doesn’t change pitch at all. Before it would be much quieter then open.

So when you switch to stealth when parked, the valves remain open?


If you go into accessory mode (press and hold ignition button with foot off the brake) you can go through the setting and you can physically test the valves with the car off.

I would try doing this and switch from track to stealth, go behind the car and look into the outer tips of the exhaust and confirm that the valves are closed in stealth. If they aren't, you probably should take it to a dealer to see whether it's the valves or the actuators themselves.