From my findings i'd say that the Apollo was bulkier, heavier, had a somewhat poor fit, and required more customization. The Apollo is a dual ply where as the Greddy was a single ply aluminum. The greddy front mount was pretty much a direct bolt up and even included its own new intake setup for the reduced intake space. The Apollo is more affordable, where as the Greddy is paying for the name along with the product. True i've only seen 1 Apollo, they all might be different as far as fitment goes. Hope that helps.