First, Let me start by thanking anyone who helps me out with this. I have had my 98 mustang 3.8L (manual) for a few months now I am not your average mustang owner. I have a 15" kicker L7 in it. Which happens to take up my entire back seat. Also I have it setting it on all chrome 20" rims (nothing racing about them). Last thing I have done to it is put underglow,streetglow,or ground effects which ever you are use to calling it. Now I would like to upgrade my engines proformance the best I can. The cheaper the better I'm on a college students income and would really enjoy the tips and advice. If you are willing to help out yet another new guy to the world or engine proformance. If you haven't noticed I like to be seen and heard where I go not so much how fast I get there. Again thank you for your time and any help givin I will post pictures as soon as I figure everything about this site out.