I've had my truck for almost a year now and am looking into doing a mod or two. I was looking to hear some opinions on the benefits of both a Cold Air Intake and an Exhaust System on MPGs and HPs. I'm not looking to have an exhaust system that is extremely loud, just louder than stock (if I go that route). Also, I have heard that CAI can make the engine sound a little louder, is this true? Any comments are welcome.