RYAN, sorry for the long response and the time it took, nope nothing on the rear end is changed from stock, i have a flowmaster 40 series done in 2 1/2 . The sound is nice for me, sounds really good in the city, 1st to 2nd is nice, 2nd to 3rd is the best, nice n loud and good tone,and the other 2 gears produce nice sound during shifting also but 2nd to 3rd is by far the best -- my one and only complant is that when i punch it on the highway or at like 50 the noise blows out and you cant really hear it, but people have told me it sounds great in other cars during city and highway driving. The guy who i went to told me that he could have it it done in no time if it was done in 2 but i wasn't worried about time dropped it off at 9 and picked it up at 5 (i think he was doing other work in between but that no big deal -- I took it to ford dealership to get a part done on warrenty and thier mechanic said that my break line is a little close but after a year and a look from me its the last thing on my mind, plus what do those guys know. After futrther looking at the pics i realized thier just ok tomoro when i get home i can take some more is you want. What type of muffler you getting and what kind of exit you like.
Hopw this helps and keep the questions coming if needed. CHRIS
