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I have some additional thoughts on this and will explain in basics for thought and the collective input.
As earlier stated the engine, trans and exhaust are designed as a unit or structure. This structure is suspended on elastomeric mounts to isolate vibration (harmonics) from the vehicle body and the driver. You have probably noticed an increase in vibration to yourself and I suspect your mirrors after the WEVOs were installed. The engine package however was designed to deal with these harmonics. Rotating equipment creates harmonics, Most engines deal with these crank harmonics with a viscous or elastomeric damper mounted on the crankshaft end called the harmonic damper. Porsche uses the dual mass flywheel to control these harmonics. An interesting thing about harmonic vibration is that you can beef up one point i.e. the Wevo mounts, but the harmonics are transferred to some other point, such as your exhaust bolts. The harmonics to fatigue metal at the rate you seem to be experiencing would have to be in the order of >16k Hz. This should create some rather uncomfortable buzzing in your car. My question to you is by any chance are you running a LW flywheel?
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1998 Porsche Boxster
Threaded Mode
