NP. That question gets asked A LOT. lol. I'm not sure what the egr looks like on a 3.0. One thing that is certain- there will be a small pipe coming off the exhaust manifold. Find that and you found an egr.
from what I've read they do help mid to top end. Bottom end people said they didn't do anything really and even some could feel a little lose but the mid-top end made up for it. I'd personaly do the headers to the catback. If I could find a set of headers for less than $400 (yeah I agree to steep) I'd do it.