VT, those are the mufflers with the valve in them. I got to sit on a panel and get a look at the prototype. I gave my opinion and expressed some of my wants and needs in a muffler. (It paid a crisp $100 bill too, for my time)
I have yet to try them out. Cannot wait to see your feedback.
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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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