For tyres, GD recommend Michelin Pilot Super Sports for road use. I initially was thinking to fit track day tyres, however after speaking with a few people, these tyres need to run at a high temperature to operate and to to this you need to drive the car hard. For normal driving on public roads, you won't be able to get the tyres up to temperature. The Michelin tyres get very good reviews online, and I have spoken to a few people who have them and recommend them. I just need to buy some now..... 245/40/18 on the front, and 275/40/18 on the rear.