What you will have to do is take the bung that came with the PC and your exhaust down to your local welder and have them either remove the one that's on there (or plug it) and weld the new bung on (or in another location).
Without getting all technical....
The reason they are different sizes is because the OEM sensor (don't remember the model) is a more narrow-band sensor and won't give you the readings you need for tuning. It's the same reason we have been saying since day one that the bike won't map itself. The sensor won't give the ECU the correct readings fast enough to provide optimal fueling. The ECU is only programmed for certain variables to meet emission needs and not necessarily the best performance...
The new sensor is a wide-band sensor which will eliminate the lean/rich cycling that the OEM sensor attempts to do through the ECU and other things very poorly. There is a lot more to it than that but that is the quick and easy...
So to get the new sensor to work or adapt it to your exhaust you have to drill and weld the new bung. If it's installed correctly, you will have no problems. It is kind of a PITA but it's worth the trouble to get maximum tuning ability.
Which exhaust do you have...?
If it's a Brock's or one of the others it may already have the correct size bung installed....![]()



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