I used to work at an exhaust shop. My boss was excellent at custom bent dual exhaust jobs. We used to do a lot of them. We also had a card cataloge of almost every vehicle made in the last 40 years. It told you exactly how to bend the pipes to stock specs. The only time we got into custom jobs is when you start adding headers and putting dual exhaust on cars that never had it from the factory. Do your homework and find a shop that does good work. That's the way I'm going to go.