A SIMPLE KEY FOR B16B TYPE R UNVEILED

Can n e one particular convey to me what kind of gain in hp i really should b receiving? Also so i'v checked out getting a mugen air filter an box to but there v pricey, dose n e one particular no if its well worth acquiring just one an what acquire I might get from it. Thanx AshtonThis b16 engine is a 1.6L DOHC VTEC four-cylinder engine, that’s