With a claimed top speed of 190 mph, GeigerCars is getting the feeling that many are running out of patience waiting for Chevrolet to release the ZL1. So if you can't wait a moment longer, then GeigerCars has an immediate answer that's for sale. The tuning company has just unveiled a new tuning program for the famed muscle car that should satisfy many. The 6.2-liter V8 has been outfitted with a supercharger, a revised ECU, and a stainless steel sport exhaust system.

All told, power output is now at 556 hp and 488 lb-ft of torque, enabling the car to go from 0 to 62 mph in 4.2 seconds. A completed car can be bought for $127,400 and components for the car can be purchased individually. Just for comparison, the ZL1, seen for the first time at the 2011 Chicago Auto Show, is slated to have around 550 hp and 550 lb-ft of torque.