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Re: 57 GMC, frame swap, 4wd, 454 big block, 4 speed
Their 5x11x22" case mufflers have always done a good job quieting things down for me. I've never messed with the chambered Magnaflows.
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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
Instagram @aceshighspeedshop
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