You are right though, stock cat back isn't a option anymore... which is why my boost controller is off and I am only boosting 8.5-9 psi which im sure is safe. Besides, I'm still completing the break in of the clutch.
Um, reason why I left the stock exhaust on is because i like the car quiet and it has 43k original miles on it... 26.5k miles on it 3 years ago.