Most of your exhaust restriction is in the cats\h-pipe. I'd replace the stocker with an aftermarket x\h pipe. (It will depend on your local laws whether you will need to get a kit with cats or not)
MAC makes a good h pipe, and Bassani makes a good x-pipe. They both give comparable gains also....
The catback doesn't do anything for performance, it'll just change the exhaust sound...
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