S4 NA and TII fuel rail the same?
secondaries are not interchangeable, but primaries are
atleast we used TII primaries on NA motor without problems and i think i am running NA rail on my TII motor now (but with FD UIM, not sure if NA rail fits under TII UIM)
atleast we used TII primaries on NA motor without problems and i think i am running NA rail on my TII motor now (but with FD UIM, not sure if NA rail fits under TII UIM)






