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Old 09-24-2013, 05:00 PM   #17
GMTool's Avatar
Drives: AGM 2012 Camaro 2SS/RS L99
Join Date: Mar 2012
Location: Southwest Illinois
Posts: 1,839
After I put headers on any noise from the CAI, (sucking air or swoosh noises) went away. Not that I did not like the CAI noises. It's just that the headers changed everything. I never heard a thud, but I never had my CAI on without a tune.
Try going out and driving in manual mode using paddle shifters so AFM won't kick in and see if you hear the thud.
CAI, Dynatech Headers, HF Cats, JRE Tuned, Corsa Cat Back, Strut Tower Brace.
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