Low end sputter, hesitation

[Gumby 1100_imp]

My understanding of the PAIR valve is that it allows ambient air into the hot exhaust ducts, via reed valves, to assist in full burning of any unburnt fuel exhausted, particularly in the overrun. Another "green initiative", so to speak. Correct me if I am wrong.

Cheers

Correct! It injects filtered air into the exhaust in order to burn off noxious emissions that were not fully burned off in the combustion chamber. It does not, as Siggy suggested, inject anything into the combustion chamber, and, as a result, the PAIR mod does not impact performance in any way. The only benefit you will experience is less decel popping and a cooler running exhaust.