the TVS, whipple, Eforce all capable of 600+rwhp.
the whipple is the most complete kit, comes with the GT500 FP, and is a proven SC kit.
the 2.8 KB will get you the most hp bc it is the biggest.
the Eforce is not 5 psi, it peaks at 9.5.
my whipple hit 8 psi off the line and stays there.
IMO...