[Dan12GT]

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.