All 4AGE engines possess the same exhaust port situation and only the 20v engine features a variance Along with the mounting experience. That change currently being that to the 20v The 2 outer holes are put further outwards that its 16V equivalent. Along with the 20v engines quickly getting popularity https://trentonanoni.blog4youth.com/31921251/helping-the-others-realize-the-advantages-of-blacktop-4age