Quote:
Originally Posted by Spuds
Doh! That makes sense now... 
As for the second hole, I would just plug it with the extra sensor OP has instead of taking the chance on something that probably fits and seals, but we aren't sure how it responds to exhaust levels of heat. But that's just me. |
Some headers come with plugs installed in the holes and leave it up to the end user to figure out where you want the sensor, or if you want to run one at all. You can pick up plugs with copper washers on Amazon for about $6.