I have an 05 6.0 that I'm trying to keep simple. I have the Atlas40 FICM and deleted my EGR, but have not yet gotten the SCT (it's on my list, probably before the exhaust). My question is this, what is the best all-around turbo back setup for exhaust? I've thought about stacks but I feel it's a little too flashy for me so I'm leaning towards the simple. I want a nice open sound, but I'm afraid of it sounding trashy. I worked with a fella that had a 6.0 with aftermarket exhaust that sounded tough at idle and normal driving, but when he romped on it.... well, an animal in mortal pain came to mind. Basically I'm wanting it to give the impression that a respectable young enthusiast is driving his maintained truck rather than a some hillbilly trying to draw attention to himself. So is 4" sufficient or to much, do I run a muffler of some type or not, does a classic exhaust sound cleaner than stacks? This is my first truck I'm actually investing time and money in, so I'm trying to have my cake and eat it too. It's my daily driver, so I'm not rigging it out for sled pulls, just a nice truck to be proud of.