Once I go three inch exhaust system with the dp... Do I still need the O2 sensor??? Do i still need to plug them in still>? This is for turbo..

 

your check engine light is gonna pop up

 

expletive it, do it gangster style.... ahhaha

 

which o2 sensor are you talking about is your car obd1 or 2 if its obd1 you need the one o2 sensor plugged in or your car wont run right if you have obd2 you need the primary plugged in and if you want ge an o2 simulator for the secondary or the car wont run right the o2 sensors are vital to the car running properly

 

Im talkin both O2 sensors.. Im OBD2, thought i didnt need it since im going 3 inch.. So i guess i still need both of them pluged in..

 

it depends what ems u are using. if u got a chipped ecu they usually disable that option so the ecu wont read the o2 sensors.

 

i think even with an aftermarket ems you will still need at least one o2 sensor so the engine can compensate for fuel. i could be wrong though i tried once running without just my secondary o2 sensor in my obd2 car and it ran all kinds of messed up. I'm kinda curious to know about the ems not needing an o2 signal though

 

you need at least one, to get a good a/f reading. And I dont really see how it being 3" exhaust would mean not needing an O2 sensor?

 

i think he just doesnt want to have to weld in an o2 bung but you gotta do what you gotta do