One thing I was really disappointed with when I bought my 992 was the exhaust sounds. Previously I had a G82 with only the resonators removed and it sounded amazing. To get the sound I wanted out of my Porsche I had to spent $7500 on a full titanium exhaust system and then a $2500 tune from M-Engineering in order to allow the valved system to open fully. The stage 2 tune also increased the hp up to 600 and the torque up to 650nm. It sounds amazing now and better than the G82 but it took some work and some money.
All of them.