 In addition to numerous small component upgrades, the Callaway GTVs included a much revised suspension, improved brakes and a twin-turbocharger system, boosting performance to near-exotic levels.The C3 received a rear spoiler and a different hood with a large scoop.The car's performance caught the attention of Dave McLellan, Chief Engineer of the Corvette, and would lead to the Callaway-Corvette association it became famous for.