To create this Clark Kent-edition Corvette Z06, Cadillac jacked up its mild-mannered CTS, upgraded most of the moving parts, and polished away rough edges with a finishing course at the Nuerburgring. Never mind the pushrods; the rumble of 400 V-8 horses galloping through a six-speed stick shift never felt so good. GM’s Performance Division fortified the body structure, stuffed the wheel wells with W-rated Goodyear Eagle F1 radials on 18-by-8.5-inch rims, loaded in four-piston Brembo calipers squeezing larger brake rotors, and recalibrated the stability system for more assertive drivers. Inside are satin-chrome and polished-aluminum accents, a more legible instrument cluster, and suede seat inserts. But what clinches the CTS V’s All-Star status is sheer speed matched to a bargain price.