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As as I see it, all exhaust are basically the same with only a very slight difference in power, and sound of course. OBX, as far as I know, is the loudest of any and is also the cheapest.
For Headers, you dont have to go 4-2-1, there is always the option of 4-1 design which would give more power/flow at higher rpms (theyre race designed). The 2 peice design doesnt look as clean (who sees your header anyways) and I dont know of any advantage except maybe a very tiny flow difference between the two where the 2 piece resists the smallest bit where the pieces come together...maybe
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