Help w/American Thunder 40 Series Exhaust

[Orange97GTVert]

That is the way to go. The only reason I went with a catback is my muffler shop guy said he couldn't fit 50 series Flows under my car with the tailpipes. I ordered the catback with tailpipes because it was made for the car and he was able to fit the 50 series on my car that way. I tried 40 series, but with the automatic it roared inside the car, so I had that changed to Borlas, they still were pretty loud inside, but sounded stock outside. The 50 series are almost quiet as stock inside but sound powerful outside which is what I wanted. Now I am wondering if I can add a catted H or X pipe without making it too loud inside. Never satisfied.