[Mr. Wyndham]

Here we go:
http://www.camaro5.com/forums/showthread.php?t=515

Rather than using the exact same Zeta platform as the Holden Commodore and Pontiac G8, GM made the front axle centerline on the Camaro about 50mm further forward than on the two sedans, according to Motor Trend.

The expensive change was made to allow the Camaro and Impala to fit 20-inch wheels without compromising steering lock and turning radius. A Holden source told the magazine the car could even fit 24-inch wheels without issue, although that's not likely to actually happen.