Intake exhaust Boost controller AFC/or ECU tuned downpipes testpipes underdrive pulley/1 pc driveshaft intercoolers 4.08 gears (if 5-speed) aftermarket clutch to hold power Race gas and running 16+ PSI boost really sticky street tires and a damn good driver and it'd be a good 1/4 mi race if they're running 12.4 like Car and Driver got. Of course, the Z is not street legal anymore.
They ran a 12.4@116 in the Z06 and their ZTT they tested ran a 14.1@103 if I remember right. That's 1.7 seconds faster (17 car lengths) stock to stock.