Excessive exhaust smoke from a Porsche can indicate engine issues that require repair. The color of the smoke helps diagnose the problem: white smoke means coolant is leaking into the engine and needs repair; black smoke occurs when too much gasoline is being burned, possibly due to issues like a clogged air filter or faulty sensors; blue smoke indicates an internal oil leak within the engine which can cause premature wear if not addressed. It is important to have a mechanic properly diagnose the cause of any excessive exhaust smoke as soon as possible to prevent further engine damage.