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I don't know if mine were "Super Turbo" or not, but I have Walker (full-sized) on the Caprice that were installed June '04 when I had the 383 in it, and by fall of that same year they had grown noticeably "throatier" in sound level and tone.(With full exhaust: headers>hiflow cats>mufflers just ahead of axle>overaxle pipes>dumping 2" past back edge of rear bumper). Seems most mufflers suffer some degradation of packing over time.
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