use a product called PB blast to try and loosen the o2 sensor. it works much better than wd 40.
also, doing projects by yourself if the only way you'll learn how to do it.
don't get discouraged.
as for the gasket, i have no idea why the old one shouldn't fit.
it shouldn't cause any damage to the engine, but would be very annoying.
might cause a few problems where the header meets the exhaust pipe though. all the vibrations can't be good for it.
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