Probably around $60 to bend the pipe and have it welded in. I wouldn't pay anymore than that, and likely it won't be mandrel bent.
Unless you like cutting the ypipe every time you have to take it out of the car, I wouldn't do it. That got real old, I was always having to cut the ypipe from the ipipe, what a pain in the ass, and then I don't weld so I would have to pay someone to weld it back up. Don't do it.
If you don't work on it yourself and don't mind causing your mechanic frustration and paying him more so he can weld it back together all the time, then go right ahead.

__________________

94 z28 M6. The usual stuff is done. 88 Silverado stepside. Getting a LT1.
"Right now I gotta go get a new Camaro, cause thats where the shit is baby!" -Master Shake ATHF
Bunch of stuff for sale.