Been spinning mine to 7600 with both intakes. Mine has 33000 miles on it. ...I can't speak for how the boss will do with the 3.15 and the auto. However my 3.73's and manual thanked me for it:beer:
I know I'm gonna loose bottom end, but I'm ok with that I cannot hook up off the line anyways as it sits, not until 2nd gear. Getting wider rear tires to help that out as well.
I also have: Steeda CAI, cat deletes, x pipe, and GT 500 corsa quad axle back. If that makes a difference.
I hope to gain something with it or at least stay about same.
But one thing I DONT want to do it risk killing the car if the engine cannot handle the added stress if spinning that fast.