4-2-1 for lower end power.
4-1 for higer end power.
brand really doesnt matter but try to avoid OBX product.
I myself got me a Tsudo 4-1 header.
eBay headers and exhaust systems are just as effective as Apexi and Greddy systems.
eBay Motors: 95 96 97 98 99 ECLIPSE HEADER + CATBACK EXHAUST MUFFLER (item 360051244794 end time May-15-08 12:06:36 PDT)
less than 300 shipped!