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Originally Posted by morepowerjoe
What does the pick up o-ring have to due with his exhaust? The oil pressure has nothing to do with how the engine runs.
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Highly doubt it’s an issue with the exhaust, unless the cats got clogged; which again, you would know (ex: lack of power). Same thing goes for cracked cats, especially when they start coming apart and jamming in the exhaust pipes. Your car/engine would run like crap, and that would still have nothing to do with oil pressure issues, which are INTERNAL (to the engine itself). And as far as the NPP valves, there’s people who run turbo chambered mufflers, with absolutely no issues; so those single valves on a QUAD exit exhaust would certainly not be an issue.
Try installing an oil pump pickup without a good o-ring, or drive an engine with a badly failing one… In the case that you do manage to drive on an engine with a partially degraded oil pump pickup o-ring seal, you’d maybe get away with it for a bit if you’re lucky, but certainly not forever. It most certainly affects oil pressure.
If it was an issue where the oil pressure gauge didn’t work at all, you could potentially replace the oil pressure sensor, as a means of process of elimination. But regardless, like others had mentioned, there’s other stuff you’d want to check and replace while you’re going through all of that engine stuff, regarding oil pressure anyways.