Also, the 30 & 40 series are both described as "High Performance Street & Strip" with "powerful agressive" sound. The 50 series are called "Performance Street" and are described as putting out a "deep mellow" sound. I'm going with the deep mellow myself (52558 - Original style, 5-inch, 2.5" pipe, 50 series, diagonally offset pipes - 69 El Camino), but a 52533 would be exactly the same physical size in a 30 series muffler.
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