Originally Posted by Chalk Two

I'm probably wrong but I think, possibly;-

Stage one is changing the paper filter for a free breathing version.

Stage two is the removal of the air filter snorkel in lieu of an open top filter cap

Stage three is the removal of the air box side panel and replacing it with an air filter.

They all increase cooler air draw and 1+2+3, by definition, would require the most additional fuel to air mix.

There's nothing nicer than hearing that 'induction roar' but I would respectfully suggest riding a bike with uncorrected fueling, especially prolonged use in the upper rev range, could cause significant damage to the piston crown or valve seats. (you have now effectively leaned out your air fuel ratio)