Guess the HP

Today we got some testing done, the Dyno is tuned up and working properly
These are the numbers SO FAR....
Peak 637 Ft lbs at 4500 rpm. I think it was making 566 ft lbs at 3000 rpm
Peak 612 hp at 5500 rpm lol.
I'll have some more numbers soon, a graph and a video we're starting tuning now,
Yeah the fenderwell headers are really making it peak early.
The crossover was 5252 rpm 600 for both
This is which the 2 inch fender wall headers correct?
Did you use header extensions?
If so, at what length?