We can get the O2 sensor out, but it ain't pretty. Fear not, though, as we also have the correct size tap to clean out the manifold threads after the air gun powers out the remains of the sensor. I used to have to replace my sensor about every other year in my first Raider (an '87) when the fuel mileage would drop off and it made a big difference.

Worst case scenario, we also have a couple of spare exhaust manifolds if things go south and you need to swap one in.

Also, based on my newly gained understanding of the EGR system, you should give some attention to ensuring that it is operating correctly.

All this is based on the assumption that you haven't gotten it through emissions yet...?

John B.