This is going to sound very trivial, but I just got the mod bug and wanted to do something. My guess is that power gain is relatively inconsequential, although the Borla has much smoother bends than OEM. As far as Borla vs another brand, I've just had great experience with Borla, especially the "no drone" aspect of their systems.
Hah!!! Mine was likewise trivial... 90% of my decision to get a catback was because of that horrible crimp in the factory exhaust....
I started to just have that cut out but the other 10% of my reasoning was I wanted a little more growl at idle, so yeah...
2012 Jeep Grand Cherokee SRT8
2006 Chrysler 300C SRT8
2005 Dodge Magnum R/T AWD
2005 Dodge Neon SRT4
2018 Jeep Grand Cherokee TrackHawk (738AWHP)
2015 Jeep Grand Cherokee SRT (Bolt Ons & Tune)
2006 Chrysler Crossfire SRT6 (400RWHP)