As we speak I am having my 2006 M3 upgraded with a DINAN S3R package. What do i need to be aware of after this is complete? How bad is my milage during daily driving going to be? What about fuel requirments? Currently I use Shell 93 octane, if I only have access to 91 octane I add octane booster. I am also adding Brembo breaks all around, 15" rotors, 6 piston in front, 14" 4 piston rears. The car is tracked 4-5 times each year.