You should start doing some of your own work, and how did you spend 590 on exhaust?!
Magnaflow website, 15717. That includes tax of course. I do look things up, constantly, so that I can understand it for myself and be spoon fed. However, if I can get information by asking someone then it would be dumb not to ask those who are passionate about Mustangs and appear to have experience and knowledge in customizing their Mustang.