HONDA B16B - AN OVERVIEW

Can n e 1 notify me which kind of gain in hp i ought to b acquiring? Also so i'v looked at acquiring a mugen air filter an box to but there v pricey, dose n e one no if its really worth having one an what achieve I might get from it. Thanx AshtonB18 engines are costlier than B16, perhaps because of their popularity Among the many automobile Group,