So, here is the latest diagnosis, FBO everyone who might have this experience. I am learning...so bear with me.
I spoke to a very good Porsche mechanic and Spec Boxster driver. After listening to my story, his conclusion is that the semi-solid Wevo's have affected the vibration dampening of the overall system. Without a lighter exhaust system, the Wevo's are not absorbing vibrations like a stock system would. His recommendation was to go back to the stock, OEM transmission mounts if I am keeping the stock muffler. So, that's my plan.
Per our discussion, the whole engine/transmission/exhaust system is coupled together. OK, that makes sense - motor mount, transmission mounts, and exhaust mounts all work together. Changing to the Wevo semi-solid mounts, without ALSO changing the exhaust to a lighter exhaust system, upset the overall balance of the system, leading to the exhaust mount failure.
I can't be 100% sure, but I have had at least two of these exhaust mount failures since putting in the Wevo's. We will see what happens when the new, stock OEM transmission mounts go in.
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