LSA or Duration to fine tune glasspacks??

GeorgeH said

what's a good glasspack sound like when a glasspack sounds like a good glasspack should sound?

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when it goes "thip thip thip thip thip", it sounds like a burnt valve 273 2bbl.
when it goes "thap thap thap thap" , it sounds like a 10.1 340 up to snuff.