 First deliveries to dealerships were posted on GM's website in March 2008, with comments that initial sales were brisk.Subsequently, May 2008 monthly sales were reported at 1,832 units against a May 2007 sales volume of 12,230 units for the Grand Prix.The 2009 model year adds the GXP version powered by a 6.2-liter V8 engine with a standard 6-speed automatic transmission or optional six-speed manual transmission (see above).