^^ I would agree. The general consensus seems to be that while a CAI and/or exhaust might make a bit of difference, you will almost certainly end up behind because those parts cost more than you will save on gas. When I had my 2002 with a 4.6 I added a CAI and it didn't make one bit of difference. The best advice I ever got on these forums for increasing mileage was regarding driving habits. A quick search will provide lots of advice on that.