For those who find their 2014 500 HP Z/28 short in power Callaway has their kit to offer. It converts your Z/28 to 2014 Callaway Camaro Z/28 SC652.
Callaway’s Z/28 keeps all the standard equipment, but ads TVS supercharger that boost power up to 652 HP and 620 lb-ft (vs standard 470 lb-ft). This supercharger was originally developed fot the Corvette. 0-60 in 3.7seconds and 1/4 mile in 11.5 secs. Not bad.