darthqwo Posted August 29, 2020 Share Posted August 29, 2020 Say, if i just have the headers without catback, so the exhaust is exposed right after the second o2 sensor, wouldn't this unviable? For take a look at this picture; clearly the sensor is prone to sensing oxygen from the atmosphere and not the exhaust. But another question is that since this is a catless header with just empty flexpipe between the two sensors, is there really a difference between the two? appreciate any input; thanks Link to comment Share on other sites More sharing options...
blackobxt Posted August 29, 2020 Share Posted August 29, 2020 Whaaaa Link to comment Share on other sites More sharing options...
Max Capacity Posted August 29, 2020 Share Posted August 29, 2020 Yes, there is a difference, the two sensors do different things. The front one is used to meter fuel. A Tuner can delete the second/rear sensor. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
dwmccauley01 Posted August 29, 2020 Share Posted August 29, 2020 Second one is primarily cat efficiency so if you exit before it won't do that much. Sent from my SM-G970U using Tapatalk Link to comment Share on other sites More sharing options...
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