intake are basically what ever one looks the best to you. the minimal gains you get from the air intake will be minimal and you are not likely to feel ant difference in power gain. so it mostly personal prefrence which ever one looks best on your truck. i have had kn, volant, and airaid all which had equal hp gains according to manufacturer numbers.

as for your exhaust goes dont waste $500 dollars on a bolt up kit just a waste of money just get a good muffler and you will see the same gains as you would with a cat back system.