O2 Sensor

[Roy Baker]

Does any one know how far from the exhaust valve the O2 Sensor can be
placed. Due to restrictions I can place it :
1) About  1  pipe meter length from the motor (exhaust valve),
2) About 1.8 meters  from the exhaust valve and  after the muffler. This
will however be  within 200 mm of the open end of the exhaust pipe. Perhaps
some power boat people  or Hot Rod fans have tried different location? The
Exhaust pipe is on the outside of the car and the reasons are aesthetics.