I'm looking at a 2014 991 GT3 but struggling to get a test drive here in the UK and have some questions before I commit.

1) Does the front feel light like in the C2S?
2) Is the car stable in the wet and cold temperatures on standard tyres? Around 3 degrees, most here seem to be on the Michelins.
3) Is the exhaust valve irritating at low speeds, I have read that the car is very quiet below 3k rpm and unplugging the valve makes the car drone. If I want to keep warranty I can't change the exhaust.
4) I have read that I should go for the revision 4 engine. Does this really matter if I am going for a car with Porsche warranty that I will continue to extend?

Sorry for the questions and thanks in advance!