a 4-2-1 header
#11
#17
If the OBX is as similar to the SSA as I think it is, the down pipe should be 2.25. Your exisiting exhaust may have to be cut a bit to get it to work with the new header as you will need a new catalytic converter and the 4-2-1 is a bit longer then the stock exhaust manifold. Dont worry, a decent muffler shop should be able to cut your exhaust and weld a new flange to it (if necessary but probable)with no problem.
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<div class='quotetop'>QUOTE (mb1604)</div><div class='quotemain'>ok thank you, my new exhaust came with a cat and so does the header... i use both or just one?</div>
Both of those are probably just test pipes anyway. Get a real cat, like Carsound or Catco. Especially if you have emmissions testing during inspection, or don't want to drive around with a CEL.
Both of those are probably just test pipes anyway. Get a real cat, like Carsound or Catco. Especially if you have emmissions testing during inspection, or don't want to drive around with a CEL.