Quote Originally Posted by RR-04-RR View Post
B18c2 engines.. vtec kicks in around 4500 then a secondary butterfly opens up around 5800

b18c7 (dc2 type r) engines.. vtec kicks in around 5900.. no secondary butterfly

so i'm assuming your EK would be a b18c2 (you can tell the difference between 2 engines by the intake manifold.. b18c2 intake manifold is reversed)
sorry to dissapoint u but its a JDM B18C.... VTEC activate at 5200 then 5800 the second runner will open up.