Exhaust manifold question

want the honest answer...even if they are NOT the "good"(and i use that term LOOSELY) HP manifolds there is only about a 2-3 HP difference between the regular old "log" manifolds and the HP manifolds.

http://www.moparmusclemagazine.com/techarticles/155_0307_mopar_crate_engine_exhaust/headers.html