How bad it is to run the car over 4,000rpm??? and is it bad to go over 80mph?? I only have 400miles on my car... so i was wondering if it could affect the performance of the car.
I don't you did any thing serious to your Z. I try and shift between 3-4 k rpms. And when on the freeway drive 60,65 and 70 mph at 10 minute intervles.