dx-si conversion

can i use ecu,intake manifold of 87 -89 integra for dx-si coversion or do i have to use 89-91 civic si manifold and ecu....my car's 89 civic dx

You can use the ECU, but not the manifold.

You can use the ECU, but not the manifold.
do i need to chage anything if i use the teg ecu or is it plug and play