The Ultraflows won't give up any power vs. the flowmasters. If anything, it might pick up a little.
Also, check out this article - http://www.pontiacstreetperformance....p/exhaust.html
Very informative and factual.
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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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