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I bought an OBX 4-2-1 header off of eBay for about $150. The only problem I had w/ it, is that the flange on the bottom of the collector where it meets the down pipe, hits the engine... I had to grind down a cross rib on the lower part of the motor (sounds bad, but wasn't). All in all, it works. I chose the 4-2-1 from OBX because all the flanges match up to stock parts and there are 2 bungs for both O2 sensors... many only have one bung.
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