I have been told that aftermarket in-tank fuel pumps are different for 1998 & up models. Everywhere I look, all fuel pumps say 1986 to 1997 or something near that. I have a 98 Cobra and I wanted to replace the stock fuel pump with a 255 lph unit. Recently I started seeing Vortech with a pump for 98 to 04 Stangs, so I bought one. I haven't had the time to install it yet. After doing some further reading, I am starting to think that the pump I bought is for RETURNLESS SYSTEMS, such as those on 99 and up models. My Cobra has a RETURN SYSTEM just like the 97 Cobra I used to have - fuel pressure regulator and all. My question is - DID I BUY THE RIGHT FUEL PUMP??? Do I need the 1986 to 1997 model pump??? Any help is greatly appreciated!!!