Are you asking for a dual exhaust? If so, then it is going to be difficult to route the driver side pipe. If you only want one tailpipe in the stock location, it should be no problem. They may think you want Mandrel bends. They help, but aren't necessary. If you get 2.5" pipe w/o Mandrel bends, its about the same as a 2.35" pipe in the curves. That diameter is plenty good. In fact, I have a 2.25" pipe w/o mandrel bends, and it works very well for me.
If you just want a single tailpipe and they tell you they can't route it properly, tell them they're full of it and ask them where they think the stock pipe goes.