O2 Sensor location
 

What is the best location for a O2 sensor. Running Sterrling headers with dry tail pipes. Thanks in advance.

After the collector. Somewhere in the tail pipe

fixx
 

remember the closer you can get it to the inner exhaust pipe the more accurate the reading will be..just make sure its between 10 and 2 o'clock on the top side of the header so if water were to get into it it can drain..