i had some 18 in glasspacks on my 69 when i was 16 and i thought they were great but then i met this guy who owned a muffler shop and had some 2 chamber flows in the back and he said try them and if you dont like them ill put the glasspacks back on. my 2 chamber flows are louder at idle than my glasspacks and sound a hell of alot better. I will never go back to glasspacks and my flows make alot more power than those glasspacks.
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