After having the exhaust mad 2 times in 2 years by 2 different shops (each charged me 600$ and I brought the mufflers, bows and pipes in)I bought me a brand new 100$ pipe bending machine and did it my self.
Only the mufflers had to be welded in (a friend did it for a 6-pack since I´m not a big welder).
The pipes (duals) from the exhaust to the mufflers are one peace now and flow smooth under the car.
Same are the tailpipes.
If you have such a machine you don`t need all those expensive bows and welding and you can make any angle at every place.
Working with the bending machine is a snap and you can make them pipes follow the form of your floor/frame in a smooth and organic way . I´m sure they sell them in the US too.
Frank