I did the Fuse 11 reset after I installed the R/T exhaust on my SXT. I noticed a small, but good difference right away! And it's a quick and easy thing to do, too.
Rlatts: did you keep the clamp system on the front of the x-pipe, or have that cut off? The clamps are 1/4" Dia. larger than the pipes there. My shop kept the clamps, and added a "ring" of metal under it so they'd fit... I've had consistent problems with leaks there, and I'm going to have them cut the clamps off and make sleeves that fit right.