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Can't personally confirm this scientifically (quickly anyway), but yes, natural freq will certainly have different critical speed as "per design" requirements originally set by Porsche Eng. You'll introduce a whole new set(s) of vibrations to the engine (in engineering terms)
Read Rotor Dynamics
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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