I have the 435 with the PPK. 6MT.
I found the original exhaust ok, but rather quiet.
PPK was installed about 2 weeks after receiving the car. Also did the "golf tee" modification (just unplugged and taped so no dirt goes into the connector and cable). Took about two days after the PPK was installed and it appeared to get louder. The downshifts (in sport) mode sound awesome ("burble"). Catches peoples attention. In comfort mode, the exhaust is a more quiet.
The sound of the car is perfect now.
If I ever want louder, I will pay the $3-4k and get the meisterschaft with dual modes (loud and quite via a switch).
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