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A lot depends on where the leak is. It is more likely just going to be annoying if you left it. It is not enclosed like a car or truck would be, and there are not too many noise police running around tagging farmers in the field. If you do decide to pull the manifold, run the engine up to operating temperature before trying to remove any bolts. If you have impact tools, those help. If impacts are not available, try giving each bolt an 1/8 turn tight first, this usually makes them easier to remove. If they all come out (most of them should), just remember to put a bit of "anti-sieze" compound on them before it goes back together. If one breaks, use the serrated "super outs", or, if you have a steady hand, size a drill bit just smaller than the minor diameter of the bolt, and you should be able to ease the remains of the bolt out with a pick or screwdriver. Otherwise, "Wire EDM" is the best way to remove the remains of a busted bolt.
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