i have a jdm d16a in my 94 eg hatch. the plugs that came with it i cannot find in the us and bought the closest to it, which is the d16z6 ones. i'm not sure but it feels like its not running as strong as the jdm one. im human and can't tell hp difference and dont have access to dynos but does anyone know whats the difference and if jdm plugs run stronger than us ones? thanks.