37 problems related to manifold/header/muffler/tail pipe have been reported for the 1999 Jeep Wrangler. The most recently reported issues are listed below.
A popping noise from the exhaust manifold was heard when consumer removed foot from gas pedal. During a state inspection the state inspector noticed a leak in the exhaust manifold. Consumer took vehicle to a dealership, who indicated this was a common problem with vehicles with a 4. 0 liter engine.
Consumer experienced headaches and dizziness for months due to an exhaust leak. The problem was discovered to be a cracked manifold. The consumer requested assistance, but was told only the 4 cylinder was being covered under warranty.