Ok back to Paris this weekend so will do it.
No, I have the normal exhaust tips bc the other ones look horrible IMO, and do not add any noise benefit at all.
If you look closely especially from the side, you can see that all they are is exhaust tips, and even though they look double, it's like the 997S standard exaust, it's only one outlet.
My car is 2002.
I'll fire it up in my parking (nice resonnance) and have a friend hold the recording device just behind the car and then play with the button on/off.
And last answer, no powerkit, bought my car one month before it was announced! But I wouldnt have gotten it anyway.