1. If you still have the stock head pipe and mufflers, you won't need a new fuel map just from the new filter...b/c with the stock exhaust system, the new filter won't allow any extra flow (even if it is a hi-flow filter). OTOH, If you have an aftermarket exhaust, it definitely needs a new fuel map (should have had one as soon as the exhaust was changed, as it was running lean even before the change).
And if you have the Ventilator intake, a higher-flow filter won't make much difference, as the Ventilator is high-flow already.
2. Again, with the stock exhaust, there won't be any extra air flow. Either way, it's the speed of the air flow that determines the vacuum: higher speed = more vacuum.