Whats up man, it's Tyler, met you at the Nissan meet the other night. What "e-bay cast iron manifold" are you talking about? I dunno if I've seen a no-name cast manifold for the KA yet. Despite what others say, I've been running the SSAutoChrome for ~2yrs now with no quality issues. Sure it may not build boost as quick as a $600 manifold but for $250 you get stainless (which looks AWSOME when heated) and it has been trouble free and building boost fine on my setup.