Re: 2 things, cab mounts and Muffler
I would vote the 20" case version of the Dynomax Ultraflow you posted.
The 14" will get loud. The 20" case Ultraflow is my go to on pickups.
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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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