A lot of people do confuse this cat issue. On a turbo car there can be substantial gains to be had from removing the OEM cat and (preferrably) replacing it with a good free-flowing one. A turbo car thrives upon reduced backpressure.
A non-turbo car, au contraire, often needs a certain amount of backpressure to perform at it's best. Thus removing cat or installing a bigger exhaust may in fact lead to a deterioration in performance...
/ Karl (97 9000 Aero, 3"...no cat...damn, my grandchildren will hate me...so I'm getting a free-flow cat...)
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