FWIW...
I've got the Borla axle-backs. I don't know if there is much/any difference in sound between them and the cat-backs, but I can tell you the axle-backs have a very deep sound (which was why I chose them). After listening to numerous exhaust comparisons on YouTube, I decided I liked the deep, powerful sound of the Borlas best. On the down side, they do resonate very loudly when the RPM's hit a certain point. That can get really annoying if you're climbing a grade and can't shift into a higher gear for a while. Fortunately the sound dies away as the RPM's increase. Overall, I'm glad I got the Borlas.
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