No full dual exhaust systems, you can do slip-ons but those have a very low performance increase. Any full exhaust system will be 2-1. Vance & hines makes one, D&D, Muzzy, Jardine, and a few others. Take your pick, one will perform as good as any of the others.
With slip-ons you can get away w/o rejetting, but a full system needs rejetting otherwise you'll be running lean and can burn up the valves. Depending on if you do a K&N replacement filter, stock filter, or K&N air pods depends on the stage of rejetting you do. Stage 1 for stock filter/full exhaust, stage 3 for the others.