What is the factory top speed setting for a 2006 Pontiac GTO with an automatic transmission?

There's no publicly released factory-specified top speed limiter for the 2006 Pontiac GTO automatic. While manufacturers often have these limiters in place for safety and liability reasons, the exact speed is rarely published. The actual top speed achieved would depend on several factors including road conditions, wind resistance, and the car's overall condition. It's likely electronically limited to somewhere in the range of 140-150 mph, but this is purely speculation based on similar vehicles of the era and is not confirmed factory data.