It doesn't necessarily need EWG but you'll have much better boost control with it. Less chance of surging.
I do recommend if you do use EWG you get valve grinding compound and apply some to the EWG and match it to the manifold. I had a small leak until I had done that but it was a cheap and easy fix.
I do recommend if you do use EWG you get valve grinding compound and apply some to the EWG and match it to the manifold. I had a small leak until I had done that but it was a cheap and easy fix.