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Likely the infamous snapping exhaust manifold snapping studs. A problem that plagues most pathfinders. The engineers at Nissan didn't properly account for a small detail called thermal expansion that causes dissimilar materials to expand and contract at different rates. Although nissan does have a service bulletin concerning this, they will not recognize it as an engeneering problem. (Probably because it would bankrupt them if they had to repair ALL the engines this affects) I'm not bitter about this, I love being chumped. So if you haven't replaced all your exhaust studs, go speak with your dealer, he'll be happy to rape...er help you.
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