Im looking for more bottom end! I heard that a header would help. I know that a 4:1 is a top end header and a 4:2:1 is mainly for bottom end. would this make much of a difference for my bottom end. And if i decide to go with this, will it take away from top end, help with top end or make no difference at top end at all. i just want something cheap. even a little more power is better!