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I think the "pancake" style cats are stock. I had mine taken off a few years ago and it was that shape. The one they replaced it with was more cylindrical.
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Robert
Current:
1986 SWB Silverado 4.3 / TH400
Past:
1985 SWB Silverado 305 / TH350 - sold 1995
1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007
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