Originally posted by MaxBoosT
Better, depending on what you want. Don't go with a bootleg header, it will rust you out or worse.
4-2-1 gives you slightly more torque.
4-1 is slightly higher in the top end.
Either case, Header won't do much for Civic's (at least for my car).
b-series respond very well to the JDM itr 4-1 header