It’s certainly no secret that a new Chevrolet Corvette Z06 is coming. It’s probably the worst-kept secret right now from Detroit automakers, especially since the C8.R race car previews its engine. It’s a 5.5-liter DOHC V8 with a flat-plane crankshaft and an exhaust note unlike any ‘Vette you’ve ever heard. Now, a fresh rumor might explain that sound.