Both in my Boxster and especially in the Cayman there was a big difference in sound, to the better.
No more strange rumble that did not fit in, like a badly tuned subwoofer, the system used on 981 is way better and its more of a analog system based on the intake.
The exhaust should be louder in sport even without Pse, the easy way is to shift modes when your standing still, there is a deeper growl in sport a idle.
I havent realy understand and its hard to find info on it but i think its a change of muffler in Sport.
Here you can hear the differens between Normal and Sport on a Cayman 2,0 without Pse
I will not guess if the aktor is on right or left side on you car, but you sould be able to spot it.
The trim that has to come of or bent down is big, all the way in front of the Wheel arch, over the arch and to the locking mechanism and also the bottom of the trunk.
If you start above the Wheel arch you can work your way to the looking mechanism and slowly bent it down so you can get your hand inside and bend the lining up as a bubble.
The aktor is bolted on the chassis and it sits pretty low just behind the Wheel arch so even if you bend down the lining your just gonna see the top.
There is a small piece of styroam on the bottom you have to remove to be able to loosen the wire.
The red thats the styrofoam on the bottom and yellow thats the Aktor.
I dont have the Boxster anymore so i cant show you exactly how its done.
Its done in 10 min tops