Originally Posted by BMW_Belgier
I read that too... But i'm not confinced about that idea...
I actually have a PE and i opened the valve with the golf tee mode already before i let the PPK installed. (European PE has a valve, American doesn't)
I think the best thing to test it, is to open the valve (you know now how) and open your window. Do some city streets. That should confince you...
The burble should be there!!!
The PPK software itself lets your left pipe always open during driving, but not during warmup. But if you get the PPK exhaust, too, it comes without the valve being there at all--it's tuned for more sound and does not require a valve to be more quiet like the stock. And this is true if your in America. If your in Europe, it's like Belgier said.