The better question would be what brand. Also what application you do more. If you drag race or street race more often than anything else a 4-1 is going to be your best bet. If you like to autox or do mountain runs then a 4-2-1 would give you a little more of a bump where you need it more. Now back to what brand. If I were building a drag/street car I would rather have a Sparks or SMSP 4-2-1 header than a DC sports JDM 4-1 header. On that same note I would rather have a Hytech or RMF 4-1. I am getting ready to put my fourth header on my car and from experience I can tell you that when you are going all motor or bolt on or spray spending the money to get a really good header is well worth it in the end. Buying a DC Sport "street legal" header is a complete waste of time and money.