So if I'm reading that right i'm thinking... hmmmmm.... $7,000.00 +/- for the Z51 option gives me 0 to 60 at 0.1 seconds faster... dead even time in the 1/4 mile, 2 mph slower crossing the 1/4 mile finish line and then after the 1/4 I'm likely watching the non Z51 pull away from me ..... So other than the splitter and spoiler, summer performance tires (not a big loss), and larger brakes... (plus a couple no biggies).. And since mag ride control is an option either way, my wallet tells me to save the 7 k unless I plan on racing the car... 7 k can buy a lot of dress up options... Maybe I'm just being cheap...