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Shaking it when it's cold, you probably won't hear a rattle. The casing expands as it heats up, causing the matrix inside to become loose, the harder you drive, the hotter the cat will get. Thus, worse rattling.
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Still looking for the right deal on another P-car
1968 BMW 1600 2 liter
1956 Ford F250
1955 BMW R69
1999 Range Rover Callaway #011 of 220 (Yeah, as in Callaway Corvette...)
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