Which is exhaust would be the best?

I have a 2003 Ford Mustang V6 with a stock exhaust system. I'm looking to change it to a dual exhaust. I saw that I can get a dual exhaust converter that hooks up to the factory Y pipe for $350 on American Muscle buy would it be better to spend more and change the pipes to either H or X pipes instead of hooking up the converter? I'm cheap so that's why I'm asking lol

Waste of money to be honest if you are gonna build a mustang you get a v8

Don't waste your money unless all you want is to look or sound good. Then get whatever you want. But the only way to really get any more power is to get tubular headers and run a true dual exhaust system. Don't worry about the H or X. All that will do is balance the sound. And YES you want High Flo Cats in the system.