The main thing that separates hot street cars from race cars is mufflers. Heck, you've got blowers, injectors, roller cams, ported heads, and anything else you can name on street cars these days.

The whole affair started several months ago when an inquisitive reader posed the seemingly simple question: "If Incognito mufflers cost $50 a pair and Phantom mufflers, which look identical, cost $30 ...