Probably not. Dyno dynamics tend to read high. Ask JPC how they got to 500WHP N/A when no one else has.
I don't like to get into pissing matches with dyno numbers. For example, I put down 432/370 at the wheels on a Dynojet and 450/404 on a Dynocom dyno. Both are SAE. No mods done to the car to add power between the dyno pulls.
The track will tell the tale.
It's all in the calibration. Yes, a DD can read high, if it's calibrated to do so. ;-)
FYI, JPC used the same dyno on their STOCK 2011 GT.
After h/c/i/bolt-ons
There is no inflation of numbers with what they claim. Further more, "no one else has" because no one else has developed a h/c package for these cars. They were the first!! oke: