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look around all the seams in your exhaust. if there is a black residue, you have a leak. if you tap on the cats with a rubber faced hammer, you may hear some rattling if the elements in the cats are breaking loose. best bet is to get the back end up on some ramps or stands and go to town checking everything..
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2005 Porsche Boxster S, 2000 Porsche Boxster 2.7L Base, 2000 Mazda Miata LS Supercharged, 2010 Toyota Tacoma TRD Off Road
Previous Vehicles: 2005 Ford Mustang GT, 1986 Alfa Romeo Spider, 1971 Alfa Romeo GTV, 1999 Ford Mustang
1977 Toyota Celica GT
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