I have it on my 6.7 and LOVE IT. I really makes the turbo spool quicker and now it WHISTLE pretty loudly. I have been averaging about 13-14 city and as high as 18.18 on Hwy.

Note:

I had to make a new plexiglass cover for mine as it cracked in the corner. It doesn't seal water very well when it runs off the top of plexi. AWESOME other wise!!!!

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2007 Bright White Quad Cab Dually 6.7
S&B Cold Air Intake
Superchips Flashpaq 3808