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Well, after some poking around the internet last night, I found a possible cause for what I'm experiencing. It seems the Variocam valve timing evidently "switches" to another setting between 2500 and 3000 rpm's, which feels like a subtle shift. Supposedly, it's normal, and it's less noticeable, or even unnoticeable under harder acceleration.
Does this sound plausible?
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1998 Porsche Boxster - Ocean Jade Metallic
1985 Porsche Carrera Targa - Guards Red
1978 Porsche 911SC Euro Non-Sunroof - Grand Prix White
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