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  1. I4/I5 Engine & Drivetrain
    Hey y'all, I have an 06 colorado 3.5L 5 speed and at high rpm's (5000+) there is a very loud whistling sound that the engine produces, it almost sounds like a turbo whistle from inside the cab. It has done it since I bought it used at 95k miles and in its stock form, but it was barely audible...
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