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I have it as well, 3rd and 4th gear from around 3-4k. Just feels like drivetrain resonance to me, most likely driveshaft vibration. I don't think any harm will come of it.
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17' Camaro SS 1LE | PDR | Summit White
Borla S-Type Axleback | Mishimoto Catch Can | LED Sidemarkers | ZL1addons DRGs | Michelin MPS4S
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