Well done [
]. The C2S didn't last too long.[
]
The 4 wheel drive does not really seem noticeable (at least not to me). 95% goes to the rear unless there are problems, so it drives quite well.
Aside from the heightened induction noises, you wouldn't know that it was turbo charged, since the power comes in quite smoothly and the lag is not obvious (unless you look for it). Porsches claim is that it drives just like a bigger engined car, which I think is reasonably accurate, although you have to remember that you need to have the boost to get the full torque (which is not the same for a larger engine). However, the huge benefit is that you get all that performance and sensible fuel economy.
You don't need to turn the PSM off, unless you want to go properly sideways.
It seems to allow you a bit more leeway on the TT. You can spin the rear tyres without it intervening (not completely tyre smoking but it allows them to slip by maybe 25%?). In the dry this is pretty hard to achieve though, since the traction is more than up to the job.
The PSM will also allow modest angles for sliding the car.
Anyway, you can play with it, but I don't think it spoils the fun having it on.
Enjoy, and you have timed it just right for the arrival of the nicer weather.
Note that you have no dipstick and the oil needs to be checked when the engine is running and warm, so you tend to forget or put it off till next time.
If you use it a lot, remember to check the levels (just before filling with petrol is good, since it takes about 5-10 secs, the engine is warm and the ground is level). Hard driving (foot to the floor) uses more oil I have discovered.