Mine has the exact same vibration you describe- @1.5k rpm. I thinks it's just a harmonic, like a range the engine doesn't like, once you're past it goes away.
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Blue Thunder -2011 LeMans Blue e92 DCT, ZCP, European Delivery. BPM Stage II. Dinan 3.45 Rear. Borla/Encore Innovation Exhaust, LUX Angel Eyes, Forgestar F14's, Turner road armor. "Last of the V-8 Interceptors, a real piece of history..."
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