I have a 2011 gt500. It's bone stock. I wanted to get the horse power numbers before I started to upgrade it. Now I need to ask but does this sound crazy. It put down 531rwhp & 515rwtq

 

Those are really high numbers for stock. Stock gt500 usually push 455rwhp. Those numbers are for cars with a smaller pulley and tune. In any case, those are good numbers!!

 

I know we didn't believe it either. We made three pulls they were all with in 5hp. So then we put another car on just to make sure

 

Yeah that's EXTREMELY high for bone stock. I assume you are the first owner? If not, somebody prior might have put a smaller pulley on.

How many lbs of boost was it running at on the dyno?

 

You should insert "...'07 - '09..." in that statement. The '10 & '11 GT500 puts more than that to the ground. A "typical" '10/'11 puts down between 470 - 490 at the wheels, depending on conditions. Mine put down a consistent average of ~515HP at the wheels bone stock, and I'm the first owner.

OP, who was the build team for your engine?

 

It's making 9 lbs of boost.