Yeah, making an exhaust system for a car where systems are available ready made is fighting a loosing battle. If you do want to continue this is what I was talking about with "U" bends. You cut them and rotate them to make the bends you need. My brother did the system in his roadster and it worked out very cool. But again, if you can by a system ready made you are probably going to save money.
Google exhaust U bend and you will get pages of sites.