I'm already fully built top and bottom by (me)
1000cc Injectors, Meth, ECMlink
My HX-40 spools 25psi just after 4 grand with no power drop in a small .55a/r bolton housing.
Currently going with a T3 Ramhorn and a .70a/r housing.. should see atleast 20psi by 4400
It's plenty capable of 650awhp
And I've yet to have a problem with stock trans, all the way up to 550awhp. Fluid type, driver mod and maintence are key
- But no need to go offtopic