I would NOT do the straight pipe. There are aftermarket exhaust that do as good of job letting it exhaust and sound good. A straight pipe will drive you nuts running down the road with a load. I have a MBRP exhaust on my 05 and really like it and has no droan.
Unless you are going to do the scoop that goes down to the air dam under the front bumper then a good quality filter will be all you'll need to feed the air unless you are planning some major mods to the motor and then a better flowing inner cooler would be my first pick before a cold air intake. The stock intake heater on our trucks are more of a restriction than the air box.
