Ls2 dyno results. Is this good?

[black67malibu]

So I got my motor off the dyno this weekend and here's the results...


It's a stock 06 GTO ls2
Ls6 manifold
Fast 92 throttle body
Nutter racing cam
GM performance valve springs and retainers
Aftermarket pushrods.
GM 36 pound injectors
Not sure on the headers cause he used shop headers

It got a peak HP of 506 @6,000rpm and 481ft @5,000 rpm's
I tried to post the dyno pic but couldn't figure it out from my iPhone

Are these decent #'s? He also said his dyno reads 10-15% lower than other dyno's in the are.