So I ended up giving the Borla gen 2 a shot. Was really impressed the the quality of the revised version, fitment was great. Had the car retuned, and dyno chart is below. Power-wise, car is K&N drop in, Perrin silicone tube, Borla gen 2, and Perrin all the way after that including overpipe, catted front-pipe (required for STX autocross class to maintain at least one cat) and resonated cat-back:
The car is completely transformed with the dip being gone. Much better power delivery for autocross. The sounds came out completely fantastic with the Perrin as well. Not raspy, nice deep rumble, and perfect manageable on the highway with no drone:
[ame="https://www.youtube.com/watch?v=Blgur2Vi7I4&list=UU6780ugqgKbKwKs7vFqzwyQ"]https://www.youtube.com/watch?v=Blgur2Vi7I4&list=UU6780ugqgKbKwKs7vFqzwyQ[/ame]