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I know the argument that it already has two efficent CATs. However two direct by pass CATS must be more efficent. There is a certain element of people who scorn these "bolt on" perfromance accessories. I ran a 15.054 at 92 at York Dragway when my car was standard, after a chip and viper I ran consitent 14.7s all day. I think the CAT pipe would do something. Tim O.