the hp diff. is pretty minimal. if you want your car loud go no cats, if you want to keep the decibals down some get the cats. also you will need mil eliminators or a aftermarket chip so your check engine light doesn't come on if you don't have cats! with cats no problem. fyi. good luck.
Leon
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03 sonic blue cobra coupe,
11.49@122mph bakerfield raceway!
11.67@120mph fontana
98 GT, stock for now.
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