PAIR removal
#11
You're confusing this with EGR. This has nothing to do with unspent exhaust gasses. All it is is recirculated intake air (and fuel). The first link has a gread diagram to help explain it.
#13
#14
Right, I understand now. The air is inserted directly into the exhaust flow; it never enters the cylinder. I looked at the diagram in that first link wrong.
It looks like this would be necessary to do before getting a bike tuned. Do most dyno/tune shops do this? Or should I do it before getting my bike tuned?
#16