I have just become very aware that this is a critical component to periodically replace (after failing HC high rpm emission). Seems fairly straight forward to do if I could only see where on the exhaust it is screwed in. I would have thought before the catalytic converter, but I can't see anything between the catalytic converter (I assume is the cylindrical 'bottle' just after engine manifold) and the manifold. Any suggestion much appreciated
thanks, guenter