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  1. I4/I5 Engine & Drivetrain
    hey guys. I have a 2006 Colorado Single Cab 2.8 I4 I've already installed a K&N Intake system and Magnaflow exhaust so my next question is what mod would you guys recommend next? I don't wanna do anything that would make my truck no pass inspection so I don't wanna gut the cats. Thanks in...
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