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Discussion Starter #1
I have a 2010 Cobalt N/A. I've put in a Cold Air Intake, and full 2.5" exhaust. In every gear when I accelerate, the exhaust gets really loud after 3000 rpm, and kinda sounds like it rattles but it's not. I have no idea what this could be. There is nothing loose all good, it is a Flowmaster cannon style muffler, I do not know the exact model number.
 

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Probably doesn't have a resonator like OEM. These are designed to cut loud frequencies at cruising speed.
 

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There is a small resonator between the downpipe and muffler. It only happens when I accelerate hard, going into traffic or just for fun. I rarely go above 3000 rpm cruising.
 
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