I had the muffler delete on my Cayenne, which IS a V8.
To be honest its too loud and at some point I will reverse it. The car sounds rough, because the resonance doesnt match. The gasses must be flowing around all over the place.
Sounds awesome on tickover though.
My 996 has PSE, which to me is the best sound.
On my 964 I have a G-pipe, and Cat delete. That sounds really good, but have to put the secondary muffler back on for track-days, as there is no way it would pass a noise meter test.