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I use method 1, OEM hardware + locking tabs. I had a manifold>turbo gasket failure last year, replaced all hardware and the tabs with new OEM pieces, I spent a good deal of time making sure the locking tabs were hammered down securely around the nuts before reinstallation.
I had a suspicion that exhaust vibrations might have caused my bolts to back out, so along with this new hardware, I had a 6" flex section welded into my downpipe (previously had no flex sections at all). I know time is the true test here, but things are great so far, it's been 1 year already, no issues.
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