Originally Posted by Z1NONLY

Seat time.

Buy a boat-load of bolt-ons and put down the best time you can on any given course. Then, take all the parts off, put the car back to stock, and get a year's worth of seat time on different courses with different conditions.

If you take your bone-stock Z back to the original course after modding only the driver with seat time, you will most likely CRUSH the times you put down with your modded car at the beginning of this.

Seat-time you will destroy bolt-on you.