if you can find a nice priced emanage, go for it mate. here's a few mods i can suggest, to compliment the emanage. & yes, i have done my research on a nice little d16.

bored throttle body with port matched intake manifold
bisimoto stage 1 cam (cause then you wont have to upgrade valvetrain)
if you wanna do some bottom end work, there's oem honda pistons that raise compression, & also wont cost you an arm & a leg.

there just a few things that can help make the y4 a little more responsive. hope it helps in your quest my friend...