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Message: <blockquote data-quote="Cmcolfax" data-source="post: 7999" data-attributes="member: 676">I ran a Magnaflow on my 96 5.7, little rumble on hard throttle but nearly stock quiet inside. On my 06 5.3 I went with SpinTech. 5000 series Sport SUV. Single 3" in dual 3" out. As you know the factory system comes out of the muffler as dual then "Y" back in to a single out. SpinTech barks at startup, and great sound through throttle range. Did a bunch of reading on what these 5.3's like, and has been said, they like free flowing.And personally I can't stand the sound of a FlowMaster. Sent via Turbocharged Droid</blockquote>