GT500 mufflers... how do I know?

[Captdistraction]

I'm interested in this. I also installed a resonator delete H pipe and aren't satisfied with the sound. Cold rasp and barely any audible difference.

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[SolarFlare]

If you remove the stock resonator they will get a lot louder especially with your headers. I had them on my 13 GT as just an axle back, with cat deletes and with catless long tubes and they went from mild to wild once the cats were gone especially with the long tubes. The 13 doesn't have the giant suitcase on it stock to quiet things down.

I have catted longtubes.