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Old 06-20-2013, 10:21 AM   #5
Dynamite
 
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Drives: 2013 Camaro 2SS/RS XD
Join Date: May 2012
Location: Washington, D.C.
Posts: 522
I have LT Headers with no cats and NPP. Cold Startup is noticeable louder. General driving is also louder. WOT is crazy loud as it should be.

I found these vids on YT.
Here is with headers:


And with just Cats:
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