I have a 96 LS and my mechanic told me my CAT is pretty much on the verge of dying..I heard that the carsound/magnaflow hi-flow cats are carb legal in CA..and it wont be illegal to put it on since my car is 10 years old and my CAT isnt full dead yet..just wanna clarify if this is all true?

Furthermore I have a Tanabe Medallion Concept G Exhaust, was wondering if I do get the direct fit magnaflow/carsound hi-flow cat will it bolt back on easily?