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From my experience, the Magnaflow system is the quietest. At idle, it is very quiet. However, at WOT it does get louder and raspier, as all straight-thru mufflers will.
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2006 Spice Red M6 - StolenFox Flowmaster Super 44 Axlebacks, StolenFox H-Pipe, U7191 Predator Rev. 9r01 - Custom tuned
2005 Torrid Red M6 - Sold
2001 Chevrolet S10 LS, Pewter Metallic, Ext. Cab, 4.3L, 4L60E, 3.42
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