Fuel filter is pretty basic to replace, you might do it yourself if you are into it... or ask for the old one when you take it in, to verify replacement. As for the tornado, I got one, discounted for 40 bucks. I think it doesn;t really help. I just had my injector system cleaned which seemed to help. I also ponied up for an exhaust system (Sebring straight through w/ 3" stainless) for 250$ @ Kartek in LA and that helped also. Kind of loud but better performance and most importantly better MPG. I ditched my Calmini and got a K&N cone which I think works better and also had to mod the bracket cause the Calmini one was not spec'd right. Good luck, hope you get it figured.