Borla is "off the chain!"
What did I just write? Good, I hope.
Anyway, got the Borla cat-back installed a couple of days ago. Pretty easy install and everything aligned perfectly. Really diggin' those 5' outlets. It's a perfect fit for the cutouts in the rear bumper, if you ask me. It's louder than I expected. Don't know how it would compare to Corsa's systems, sound-wise, but it's louder than the Walker Ultra-Flo cat-back that was on my '94 Mustang GT [my last Mustang]. It just sounds really good...the right tone and right amount of loudness for a GTO. Should sound like this right off of the showroom floor, imo.