I will be putting in my turbo soon. I have a P06 OBD I ECU. Since the OBD I has only one O2 sensor, does it matter where I put it? Also where can I put it? I know the stock placement is on the exhaust manifold or cat, however can I just weld a bung onto my downpipe? TIA.

 

as long as you are before the cat, you should be fine.

-PHiZ