i'd go with the edlebrock manifold. shorter, fatter runners. bigger plenum for larger throttle body. i'd run ericks 72 mm tb if you plan to boost 20 psi daily.

almost sounds like unlimited funds setup. do a stainless steel exhaust setup starting from a stainless steel equal length turbo manifold. is it a ball bearing turbo you are running?

3" custom exhaust, no cat, all the way back. a waste gate that dumps right into the atmosphere.

yeah it'd be cool.

400+ whp.... hope you doin' some sort of axle upgrade and LSD while you are at it.that much whp. i'd go with longer gears.

ls tranny with lsd.