I'm interested in getting a chip but don't know which. I got a 2004 3.9L V-6 w/ overdrive(do all have overdriver and are all 2004 3.9L?) and I'm looking to make a few upgrades nothing hardcore. I want room to expand and not have a poorer quality chip then the rest. I'm really looking to increase top speed. Don't want it to cut off at 115, wanna be able to run 160mph. What chip do I get?