Hello people. I just bought a lifted 04 silverado 1500 5.3L V-8 with a Fab-tech lift in arrival blue and love it. I traded in my 01 eclipse for it and what a difference. I am in need of some performance help. I am looking to put a CAI intake an exaust on my truck and have to clue as to which is the best brand for more horsepower and better gas milage. Any Help that anyone can give would be greatly appreciated. What is the difference betweena '03 1500 silverado engine and an '04 silverado 1500 engine?? Reason being, I have looked for aftermarket performance parts and I can't seem to fins anything for a '04.