I'm about ready to get my exhaust done and i was wondering what would be better for mounting the O2 sensor. I've got the RB off-road head and i'm going to have a collector made 'cause i'm going single straight pipe, my question is should imount the O2 sensor in the collector so it read both rotors or should i mount it on the header w/ bung and is reading off of one rotor okay?

 

You'd probably be better off reading from both. Most headers including RB's streetable have the bung reading from the collector.