Jim Hand runs 2-1/2” mufflers with a 3” X-crossover reduced right before the mufflers and 2-1/2” tailpipes on his 11-second Le Mans wagon if I’m not mistaken.
I know one of his favorites was the 2-1/2” Dynomax Super Turbo 17749 20” case muffler, quiet and free flowing. I use those mufflers on both of my Pontiacs and they’re great mufflers for quiet street performance.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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