If Chevrolet can produce a Camaro that is 90% it's current size & weight with progressive (leaner/meaner) looks of the 1st + 5th gen. and powered by direct injection 340hp V6, 460hp na V8 SS (470hp na V8 Z-28) & 720hp V8 ZL-1... they'll continue to sell as well, if not better than they do now.
Upgrade all lighting to LED w/o the euro (sunglasses) taillights... design something that can pass world standards, yet look appealing to your largest customer base, the US market.
Add some gimmicky things like a mild cam engine sound and factory exhaust cut-out options.
Try to keep entry pricing at current levels +/- inflation...
