Looking at getting a winter tire and wheel package from the Tire Rack for my 2007 328i Coupe with Sport Package. Couple of quick questions: 1. Tire Rack recommends 16" tires, but the car came with 18" - asumme the smaller tires will fit over the brakes? 2. Not crazy about getting the TPM system for the winter tires - is it really necessary? 3. Is Tire Rack the best place for this purchase? Thanks for your advice.