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Originally Posted by Goose51683
... a new exhaust and will have the headers wrapped as well (I hear that can increase airflow as well).
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Wrapping the headers does nothing but promote rust, really. The idea is to help with cooling, and that's true of the super production bikes, but it won't make a lick of difference for the GZ. The wrap will trap moisture and your head pipes will rust faster than normal. If you're doing it for aesthetic reasons, that's all good. But it's not going to change air flow. If you go with a completely open exhaust (ie, no baffles) then you'll want to go ahead and drop in that 140 most likely.
It's ok to be a little rich (more fuel) as this will keep temps down.
It' not really ok to be too lean (more air). A very lean setting will fry your valves and just generate more heat than you want in general.