The lower intake is what has the fuel rails and the injectors on it and connect to the fuel lines. On the 2001 3.0 Taurus the lower intake is returnless. You have a Return style since your car isn't a 2000.(that's when they changed) If you were to change to returnless you'd have to swap the fuel lines, gas tank, fuel pump, and PCM out of a 2000 SVT. No small task and to think i have to do this...
