I just removed the AI from my TBA. I bought the removal kit from Brent at New Speedmaster. The kit was simple to install and the instructions were easy to follow.
I've just come back from a quick run and the popping in the exhaust is almost gone. It could be my imagination but I think it sounds a bit better too.
Anyway I just wanted to thank Brent for the removal kit.

(I also bought the universal mirror adapters but that is a another story that will play out at Xmas time when I spoil myself with new mirrors

)