[fishman]

The changes are on the motor exhaust manifolds since they are in the valley of the motor. There really isn't any significant changes to the exhaust system after the turbo.

You stated you wanted more sound. Even on a straight piped truck the 6.7L isn't sounding like the older trucks. I could hit the pedal hard on my 6.0L which gave out a NICE rumble and tone when running down the road. This 6.7L just doesn't sound the same to me when driving the same way.

I second that. The 6.7 is very quiet. I’m straight piped and cut out before the resonator. The most noticeable sound is from the waste gate. Most folks say it sounds good. I do get a little droning in the cab in 5th gear when towing. BTW, I left the resonator and stock tailpipe tip in place to keep the stock look.