MKW:
If the "vibration" is at 2800 rpm in any gear, then it's coming from the drivetrain incl the differential,motor , exhaust system, esp if it's more like a resonant booming with the windows rolled up , on a smooth road . If its a certain speed, then it's prob in the suspension : front end you'll feel in the st wheel, rear end will give a buzz in the seat of the pants .
MKW, that is really helpful. Although I felt no vibration yesterday, I wasn't going at 2800rpm consistently. I'll check it again and try to determine whats going on... if anything.
Many thanks
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2010 997 GT3- Black/Grey