I've got the exact same deal. Xpipe, but with Schumacher Headers. It is loud, but it really sounds awesome from the outside. My only issues was with the xpipe, I'm having problems putting on a driveshaft loop. Other than that, yes there were some fit issues, but wow, what a sound. I went with the Dynomax Ultra Flows. I'm not even gonna try to put in a sound system.
Tony
man i can only imagine how loud in the car is with your system! must run great though. does yours quiet down in the car above 40 or 45? mine gets alot better in the car from above 40. love the color of your demon by the way!