Borla has an axle back and a catback. The catback is the expensive one but it gives you all the piping you need from literally cats back

It also allows for easy install of cat deletes / headers because it comes with a shorty after car X pipe.
I personally opted for this because I wanted the benefit of increased pipe diameter from the cats back (2.75"), also the catback system deletes the cruddy stock resonators.
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Airaid CAI | Borla S-Type Catback | Amsoil 10w30 and MTG Trans. Fluid
382hp 387ft/lb | 1/4: 12.9 @ 112mph