::sigh:: another typical HAN post...

anyway, in order to help you i would need to know your power goals, future plans?...

the DC Sports, GReddy, yada yada yada are all made on the same platform there is no difference between them. Only when you get into different designs like stepped-header design (Comptech) or a Hytech/SMSP header for an N/A monster will there be better gains.

the usual aftermarkets offer little gain, but its better than stock. 4-2-1 header design is better for a broad powerband, however 4-1 will give you better high end gains.