HONDA B16B - AN OVERVIEW

Can n e 1 convey to me what sort of gain in hp i need 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 particular no if its worth having 1 an what get I might get from it. Thanx AshtonNonetheless, the demand from customers for anyone K20 variants has also made them costlier and more durab