I've seen the cheap headers on ebay as well. The price is tempting, and I also wonder if the Dansk, B&B, Turbowerx, etc headers are functionally any better. What worries me is cheap construction, and thus welds cracking, as well as poor sealing due to poor tolerances.
If anyone installs a set, let me know how it goes. You should be fine relocating the secondary O2s after the secondary cats.
Patrick
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