Chevrolet Corvette Z06
The Chevrolet Corvette C5 Z06 is a high-performance version of the C5 Corvette sports car. Introduced by Chevrolet as their corporate and performance flagship, production began in 2001 and ended with the 2004 model year.
Starting with the 2002 model year, the LS6 engine was uprated to 405 horsepower by means of a larger volume air intake, stiffer valve springs, lighter sodium filled valves, more aggressive cam phasing and lift, revised pistons, and revised block.
The Z06 received several other refinements in addition to its unique engine, suspension, wheels, and tires that either enhance functionality, differentiate its appearance from the base-model C5.
Source: Chevrolet press