There are a couple of threads where different things have been tried with the exhaust. Mainly beyond doing the catback, is the scuba tank will be removed (which isn't replace by the catback).
For what it is worth... depending on where you live.... removing the cats might give you grief. Also may result in a check engine light.
For what it is worth... depending on where you live.... removing the cats might give you grief. Also may result in a check engine light.