Cast Iron Manifolds

Listen listen this is a FACT....use what you got if you can.... The "HP" manifolds give you a WHOPPING 2-3 extra HP and THATS IT...and thats over LOG later model manifolds that are a DIME A DOZEN...like was said if you need that extra 3 HP so desperately expect to pay BIG BUX for it...other than that just get a set of later model 360 manifolds or use what you have(if you can).

here is the shootout article Mopar Muscle did on a 300 HP engine

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