It seems much of the older obx header crap on sf has been archived, or deleted. I could only find this one
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Did you install this OBX header yet? Did it go OK??
I attempted to do mine yesterday and had a LOT of trouble. First the front part of the flange had to be ground A LOT to clear the head just under the distributor.Then the downpipe angle was ALL WRONG! (couldnt even attach it without hitting the transmission crossmember) and it therefore needed a bunch of additional bending (we had no choice but to just do heated bends) THEN after extending the O2 sensor wire 4' so it would reach we found the O2 sensor hole in the header was WAY TOO SMALL for the sensor! So we drilled it out about 3/16" larger so the sensor would at least fit in BUT THEN found the O2 flange mounting bolt/stud holes were not the correct spacing. THEN while using a die grinder to oblong the holes so we could mount the sensor, the flange broke completely off! - no doubt due to the fact that we had made the wall TOO THIN after drilling it to accept the sensor.
We ended up having to weld up the OBX sensor flange (what was left of it) and added a thread-in bung further upstream into the collector (the threaded style was all they had at the muffler shop) and used a GM thread-in 1-wire sensor. (not all that bad anyways as it will now work with the LSU4 WBO2 too)
But because the downpipe alignment was all screwed up , our test pipe and catback exhaust was now all out-of-whack and we had to bend it a bit and cut and reweld a couple of the hangers to make it fit.
All in all the WORST "bolt-on" header installation I have ever experienced.
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