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Exhaust Manifold

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Like nearly all older Jeep 4.0L tubular exhaust manifolds, this one was cracked. We were thinking that since only half of one tube was still welded to the collector, maybe our O2 sensor was getting bad readings. We welded up as much as we could, but there was about a third of the total area we couldn't get to between the oil pan and the manifold. We saw no change in mileage from the repair.