the difference in the 07 is the tune but from what Ive seen the denali is faster on a straight line than the escalade.

Well atleast my silverado is faster than both of them

 

My Yukon was also faster then them... but I raced a guy who had bolt ons and he whipped my cammed 5.3.....

I've finally bought the denali, won't be doing anything internal as of yet, I'll wait for the warranty to die which is around 6-12months away...full bolt ons and tuning is all, I'm hoping this thing should fly!