I guess all the other Qs were well answered but, I probably can help with these2:

3- I replaced my performance tires for touring tires. I've grown tired of the loud road noise of the peformance ones and found a substantial improvement in comfort and handling with the new set of Bridgestone Turanza's. Very significant improvements in rolling noise and, surprizingly, bumping noise to driving on the bad Detroit roads. Performance acceleration seemed not affected but, handling in wet and snow conditions were greatly improved. Durability seems to hold well (~15k miles to date) however, the old Cooper set lasted 35k miles, even with my usual brisky driving. Turanza's should be my recommendation to you.

4- Take the car to the dealer for any engine repairs. Your car is too new and that cost me only $43 when I replaced the Turbo seal (60k miles) with them.