My car dynoed as high as 376rwhp and 380rwtq bone stock. And it was an 80+ degree day. It was hot, folks, and I pulled right off I-95 and onto the dyno 10 minutes later.
That was bone stock. There are all kinds of tricks you can play with the dyno. I could've thrown ice bags on the intake and let the car sit for an hour. You could play with correction numbers on the dyno's software. You can play with tire air pressure. I'm sure there are plenty of things you can play with that I am totally unaware of. I mean just look at it - there is a difference of 8 rwhp just in between pulls. Do you really think there is a difference between a car that dynos 380rwhp and 390rwhp?
Who cares what your car dynos?