I look at it this way. You're not gaining much with replacing anything other than cat back on the stock turbo. I you want sound, the Ralliart is excent in delivering that in spades. We have one long ass silencer in teh middle, pretty much a straight pipe any muffler shop can replace for 100 bones. Lots of choices for cat back and enough room to easily and cheaply have an axle-back fabbed as well. I can tell you first hand, that a muffler delete alone sounds bad ass.
The pure, unmodified factory sound is very unique.