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2001 Boxster S Engine Vibration

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2001; Engine (type, size, modifications): 3.2L, stock; Total Mileage: 48,000; Transmission: Manual;

Bought my 2001 Boxster S new, delivered Nov 2000. At 15,000 miles, dealer fixed RMS leak ("R&R trans, clutch, flywheel, pressure plate, R&R rear main seal, lubricated clutch fork, cleaned engine"). After this service, I began to notice what I now know as the infamous 3000 RPM engine vibration. In all gears including neutral, not load dependent, but intensity does vary (seems like intensity is near zero with cold engine, beyond that I can't determine any cause and effect). After many trips to dealer with NTF results, at 25K miles they stated, "Some vibration normal at this RPM. Made more noticeable due to torn engine mount, allowing excessive lateral movement of engine. Offset to left 4 mm." They replaced the mount and vibration was gone.After a few thousand miles the vibration started reappearing but at a greatly reduced intensity. By 30K miles it was pretty strong again. By 39 K miles it was as bad as ever. At 45K miles I asked dealer to check and replace motor mount. They reported that it had only very minor tears and not a problem, but replaced it at my request (and expense). It had no effect. Vibration is still as strong as ever.Note that I do autocross the car, and have made a handful of hard starts (not abusive in my mind, but hard engagement of clutch from standstill). This may be part of cause, and a new motor mount now and then I can live with, but now that doesn't seem to solve the problem. Any ideas?

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