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most manifold problems are caused by gasket/seal failure rather than the manifold itself - the aircraft manifold is subject to higher tempertures and preasures than a car engine and that is often compounded by flying at high altitude a common reason for manifold failure is called "bootstrapping" which is a condition caused by low rpm at high altitude causing manifold preasure to drop so low the wastegate closes - it can easily be corrected by increasing rpm also the exhaust gas preasure is often used to help turn a turbocharger turbine and if the preasure is allowed to drop to low the trubocharger will no longer work efficiently and engine will lose power these are reasons why rpms/manifold preasure should not drop to low in an aircraft in cruise flight
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