Don't go with a jet chip. When you are just using a chip it alters the signals entering and exiting the PCM, doesn't change them, the gains are noticable at first, but the more you drive the PCM will learn what that is doing, and slowly adjust itself back stock, it will detune itself, now a programmer on the other hand will remove your stock tune and implant an optimized tune. This is the way to go, you'll be very pleased with what these programmers can do. Also keep in mind when doing exhaust work on the 3.9L, its a backpressure hungry motor, the more you open up the exhaust, the more low end torque you will likely lose, best thing you can "opinion" is hack off that restrictive 14 foot long hunk of rust muffler you have now, and put a nice stainless 20+ inch magnaflow on it, these longer magnaflows are great for the smaller motors, have a nice deep mellow tone, because you don't want a loud raspy v-6, but a little rumble is allways nice. Also that 3.9l will run hels better if you run 91+ octane in it, and believe youll make the cost up in gas mileage gain, if its one thing dodge is good at is retarding timing to reduce knock, and retarding timing kills power, so put some high octane in that there sum beach. If it were me and on a budget i would prolly go with a cheaper intake, from ebay, just a slight bent pipe with a filter that connects to the factory air hat, this will breathe much more air then needed for a smaller motor, and won't put a hole in your wallet, just make sure you get one with a name brand filter with it, like a K&N. Put a set of autolites in it also, good cheap plug.
