I had glasspacks on my 97 Chevy with the 5.7 350. Had straight true dual exhaust with some 3 1/2" x 24" long tips coming out the back corners, that truck was LOUD! It was definitely the winner of our "who has the loudest pipes" contest between friends. On my current truck (07 Silverado Z71 w/ the 5.3) I just have flowmasters but I'm not sure of the series (was on the truck when I bought it). It has a good deep tone but isn't loud.
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