Thanks for these postings, I'm still a bit confused by things.

So for a simplon, I need, two filters (stage 1 & stage 2) which is 1) inside and 2) is the side filter, it that correct as per the pic above ???

I also require a ken mod to adjust the fuel once the stage two is in, have I got that correct also ??

And if so, where does this o2 controller thing folk mention fit in to the equation ??