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Just an x pipe itself will make your car quieter. Removing the cats is what makes it loud. You can just remove the cats if you wish. The x pipe will help with drone but if you have stock axle backs you shouldn't have any drone.
I installed just an O/R Xpipe on my 2001 GT back in the day (my first mod) and it really woke her up in the sound department...when I got the Spintech installed, holy moly.