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Congrats on the VX find ian.
As for your codes, if the prior owner was ricing, I would do a thorough check of the wiring, plug/unplug engine bay connectors a few times, check that ground straps are clean and no broken/bare harness wires. My DX would throw codes regularly, a quick plug/unplug of the harness would fix it, just a bad prong in the plug. If you do a search on here/elsewhere you should find the Civic shop manual in pdf format for free... has all the flowcharts for dealers to follow to trace codes. Very useful, just print out the pages for the codes you have and follow the chart.
As for the header, mines had one since I bought it, I'm very pleased with my MPG. If its a commuter car save the time and money and leave the header in. Spend the time on your driving style, and the money on a scangauge or vac gauge. Good luck!
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