I just bought a 1999 Silver Civic. It is currently stock. Performance wise I want to put in a AEM V2 Intake, Tenzo Venturi Cat-Back Exhaust, DC 4-2-1 Headers, and an Apex'I S-AFC II Air/Fuel Computer. My car puts out about 127HP at the crank and I am usually getting 30.5 MPG. How will my mods affect my HP and MPG? Are any of my parts not worth the money? Would you do something different? Any suggestions performance or appearence would be appreciated.