I have a 4.4i with sport pkg and the 4.6is 20" wheels. At times I think about trading it in for the 4.6is but the stealer wants too much of a difference, so I may hang on to it for a while. Especially since it has every option possible.

So...what's the optimum way of getting more horsepower...without bolting on a supercharger?? How are the Dinan Stage I and II upgrades and do they add a noticeable difference? I am thinking about adding the air intake, software upgrade and exhaust.

Even after adding the above, it will still not be close to the 4.6is!