The oem jdm 4-1 is comparable to the jdm dc 4-1 and a step up from the stock usdm 4-2-1 header. The oem jdm 4-1 will not bolt up to your stock exhaust, you will need a new cat.

To the OP if you have supporting mods look into SMSP, Hytech, Burns, DTR/SSR or if you are more budget conscious Profab, Sparks, F1 Spec or a similar knockoff. Remember you got to pay to play.