dual exhaust on a 273

I'm sure it's been answered a thousand times, but what size pipes would be best for a dual exhaust system a 273? I'm guessing 2.5 inch pipes..? I also am thinking of doing basic Turbo mufflers because I'm not looking for a crazy loud sound or anything ridiculous like that, i just want that really nice toned sound at idle and a decent rumble at take off..

Any suggestions?