Quote:
Originally Posted by MackSteelPrivateEye
I havn't heard a system your that sounds significantly better than NPP. NPP is a bit raspier than I like, but so are most of the after markets setups. I think the only way to get rid of rasp is to go to an older type fiber packed muffler but they just burn themselves out over time. 
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I would really like to do this, but not sure if there is an easy way to get the stock NPP open and pack it then weld it back without a hack job. To me the corvette NPP sounds so much better and refined, the stock camaro NPP just sounds obnoxiously loud, raspy, fartty, and lifted truck straight pipe sounding. From looking at people cutting open the NPP on the corvette, it looks like there is packing (fiberglass?) in the one smaller chamber.
I've heard the packing keeps the rasp down, but I've also heard a lot of other things that seem like its just something someone heard someone else say so they are repeating it. Not trying to call anyone out, but its hard to quantify "rasp".