Re: mufflers for 5.3 with headers
Look into the Dynomax Ultraflow line or the Hooker Aerochamber. Both give a nice sound and are pretty mellow travelling at low speed and on the highway.
Flo~Pro is another company that I've recently tried. I'm running their #2510 on my 2500HD with factory 3.5" exhaust. Has a nice sound.
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E
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