I have a 6.0L Diesel Dually and the only other mod I have is the Power Pup by Bully Dog and I did change the air filter and I was wondering what would be the best exhaust system to do to hear that sweet turbo whistle whine just a little bit louder. Would a simple straight pipe do it or would I need something else and if I do need something else how much on average does it usually run? I don't really want to have too much into just the exhaust system so I want know if a simple straight pipe would do it.

Thanks