Every perforated core muffler I have ever had was great. (Magnaflow, Hooker Max Flow, etc.) Very mild at cruise and idle, opens up nice when you apply pressure to the loud pedal.
I expect these to be the same. I originally wanted ultra flows, but they stopped making the 18" case version in the non-welded. From what I have gotten in real world feedback, these are the next best thing.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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