How did they alter the 981 to create the GTS?

[Clevers]

I have a 981 S and while driving out of our cul de sac last weekend a friend of the neighbour came in with her GTS. We briefly chatted with windows down and it was the first time that I have heard the cars side by side. The GTS does sound better, so what is it that Porsche have done to get that sound over a 981 S?

Thanks

[Clevers]

Twinfan said:

Only a pipe for induction noise behind the seats - you only hear it in the cabin

No, listening to the GTS external noise alongside my 981 S, the GTS exhaust sound is different. It is a deeper sound with more burble about it.