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Do yourself a favour. Get Michelin Pilot sport 2's fitted. I did and what a difference I don't need to fanny on with the A-DCCD in the wet cos it just grips. In the dry in awsome. I have the 18" wheels and the spring kit. All 3 mods just transformed the car.
PS. Porsches came fitted with PS2's so they can't be bad, plus in the Prodrive spring kit fitting manual mentions the PS2's aswell.