I had a 04 Denali with the 6.0. Intake, headers, flowmaster 50 series, superchip, throttle body spacer. Just got a 2012 with the 6.2 and it was a huge difference. I put a K&N and cat back big block 50 series flowmaster on it this week and it opened it up to a whole new level.
It is possible
Skyjacker is the only maker of a lift for denali's without reduing the drive shaft ends. rocky mountains suspension sells it. Did it about a month ago. It's only 3 a 3 inch suspension, but it can be done.
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