ALL THE INFORMATION THAT UR GETTING FROM THESE PEOPLE ARE USELESS. SO FOLLOW MY INSTRUCTION. go AT THESE WEBSITE WWW.TEAM-INTEGRA.NET THEN REGISTER IF YOUR NOT A MEMBER. THEN SIGN IN, THEN CLICK ARTICLES ON THE TOP RIGHT SIDE, THEN CLICK PERPORMANCE. uNDER EXHAUST SYSTEM, CLICK ON EXHAUST PURCHASING GUIDE. tHERE U'LL GET WHAT U WANT. GOOD LUCK