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Just found this thread... I had two different setups on my 07 C2S. First was AWE headers, cants, and mufflers. Great stuff, better performance and sound for the track, but too loud for a street car around conservative CT. Second try was X51 headers, AWE cats, and stock mufflers. Sound was perfect.
In all cases, the rasp was there from day 1 with the OEM setup. In each modification combination, the rasp was reduced or eliminated. Meaning the "ball bearing in a blender" sound was most pronounced with all stock, and was eliminated with both of the mod systems.
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