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for ES01-03 (d-series)
is there a 4-2-1 header? or its just 4-1..coz its too narrow/short to put in a 4-2-1 header..

 
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DC racing makes a set... you will have to move your cat a ways back to fit on the kit, though. I dont understand the code you wrote but if that means the d17a1 you will have to buy a new cat because you will lose it when you swap out the header.