Halltech's 2015 Corvette C7 Z06 Stinger-RZ will put you in the winner's circle. 1/4 mile e.t. improvement= .41 seconds; 1/4 mile trap speed improvement=6 mph! Dyno tests have shown between 38 and 52 RWHP with no tuning. Two recent dynos at A&A Corvette (91 Octane-A8s) reported 44 RWHP/41 lb-ft and 50 RWHP and 43 lb-ft with the stock ECM parameters, i.e. no tuning. The ST689 filter is installed on all orders. Our dry filter is optional (ST589) Our Nomex Sock heat shielding is optional for $45.00 (product code Nomex). Just in: Halltech's Stinger-RZ runs a 10.77 @ 128 mph! Our customer previously ran an 11.16 @ 122 mph showroom stock. The DA was 2400' on the before and after 1/4 mile pass.