Hp manifolds...any better?

for your 400 depending on the build. i am a firm believer that hps are good specially in darts if your around 500 to 600 hp limits they are 3 inch outlet so to get max flow run them to 3 inch pipes. i believe they flow better than shortie headers because shorties are restricted anyways for a bodys defeats the porpose of having headers lol hp manifolds are in my opinion a good way to go if installed right in a 500 hp aplication