The dealer cat was priced at $3770 for my car. About double what the whole car is worth. There are aftermarket systems with pre-cats. Mine, made by CAT, came with one. The pipe is fatter so I had to find a slightly bigger U clamp for the support bracket. That was the only problem I found. It is plenty quiet.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma