[douglas robbins]

I'm interested in installing an O2 sensor to help the Motronic brain manage proper fuel delivery but the problem is, where would I install the sensor?

I have a 1984 3.2 Carerra engine in my 914-6. The engine pipes through headers and the headers meet the muffler in two different places (about a few feet apart). There is no cat.
So this is the problem: in a stock 3.2 the O2 sensor was mounted in the cat.

My problem is that at no point before my gasses reach the muffler do the pipes all come together like they do in the stock 3.2 motor where the cat usually is. So I don't know where to put the O2 sensor to get an equivalent reading. Anybody ever deal with this?

Douglas