Originally Posted by killerkanadian
On the note of Downstream 02 Sensors. Eurocharged has figured out in their tunes to make them irrelevant and not read a check engine light.
As far as i am concerned, keep the upsteam O2 sensors and delete the downsteam.
Needwings has also figured out to fool the O2 sensors without doing anything to the ECU. I personally would like to run his cat delete downpipes with a rear mount turbo.