Correct, original application is a Cummins 24v auto. The whole engine seems quieter, a lot of that could be the "muffler" effect on my straight pipe 5" stack. It's actually very quiet though, decent amount of whistle but not terribly noticeable in the cab. Wide open on boost it has a pretty mean growl.
i would like to see what all was needed to make this happen when you get a chance to type it out.
on a closed course in Mexico of course.