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There's no way you can make any car but especially a supercharged engine like the LT4 quieter than it is stock without compromises. And in this case it could be power/reliability/exhaust temps/burn your cats. Or you're going to have it tuned after these new Cats ("Laguna pipes") are installed and going to be forced to run different timing and probably more fuel to keep the cats cool. That's my guess at least because I've never seen this done and don't know how in the heck it's safe or worth it. (And it probably won't make a difference if both Track and Stealth got you flagged.)
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