Can somebody please explain the bungs in the headpipe. My understanding is that the system uses them to monitor the O2 content of the exhaust to control the fuel mixture. Is this correct? Why are there more than one size? Does a power commander use them?
Thanks,
Vince

 

Red,
You are correct. Different sizes for different applications. Older PC does not use them, current PC5 does not use them but has the autotune option that adds wideband sensors.