4-1 header Catalystic Converter delete
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4-1 header Catalystic Converter delete
7th gen civic ex, does the compression ratio have to be changed or does the car come with 4-1 stock? Do i have to change the compression ratio with the 4-1 cat delete headers with full cat-back exhaust
Last edited by JDM7thGEN187; Aug 8, 2010 at 08:36 PM.
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