Here is what they had to say on another forum ..
Last night we had a 2009 G8 GXP on the dyno. The car is a 6-speed manual with less than 1,000 miles. The only modifications were a Magnacharger MP 1900 Supercharger and Rotofab CAI.
Preliminary numbers were 552 RWHP / 496 RWTQ. We supply 60 lb. injectors with all of the kits we sell, but the car ran out of fuel pump. After the new pump is installed we'll be back on the dyno for more power
Crowley