Non- stock O2 sensor?
 

Anybody know what the difference is between O2 sensors? Im about to make a custom exhaust with 2 (1 for Microtech, one for Guage) Sensors, and i want new ones, but im wondering whether i have to get rx sensors(expensive as solid gold shit) or can i just get a random gm 02 and use it instead?

thanks
pat

good question, i wanna know too!

O2 sensors are O2 sensors. Any of them will fit . Some are 1, 3 or 4 wires.
You decide if you want a heated one which is the 3 and 4 wires. I'm using a Chrysler heated O2 sensor. The high cost for the RX7 or any one made for that particular car is the connector. All you need to so is solder and heat shrink or use butt connectors.
FC's are 1 wire as you know so just solder to the harness . A 3 and 4 wires are 12V, ground and sensor . Just get a universal Bosch O2 sensor .

I'm using a Bosch universal from Advance Auto. Paid $18 for it.