There is an undesirable side effect to all of that torque our favorite toy produces and that is a cracked exhaust manifold. In the 12 yrs I've had my 20 yr old Wrangler I have replaced one exhaust manifold and two headers. My exhaust man suggested the following fix which has worked out great:
Whether or not you have one of these:
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You need one of these:
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When the engine twists it flexes just enough to take the stress off the exhaust manifold. Many newer vehicles come with one.