i am replacing my F23 with a newer F23. does anyone know if there are any extra sensors on the ULEV motor? will the 2001 ULEV motor drop right into the car and directly replace the LEV motor? will i need the 2001 ECU? do i need to use the 98 Distributor for the immobilizer? will it work? whats the difference in the 98 and 01 Motors? thanks