'02 and '03 for the pipe. You could use '01 pipe but you also need an '01 silencer because the pipe/silencer connection on the '01 is shorter if I remember correctly.
Stay with 02 Some of the 03 had a donut where it hooked to the Y pipe. If I rember the 700 and 800 used the same pipe with a different can. The 01 pipe will not work as where it exhausts out of the belly pan is foward of the 02and 03 .