New Intake Manifold
 

Hello people,

I was thinking of doing one last engine upgrade to my 92 civic si hatch. Recently, I've been considering a new intake manifold. My question is if i were to replace it, what kind of response could i expect to achieve.

Also, if i were to go from oem to oem, would i notice a difference? Or, if i were to go from oem to aftermarket, would there be a significant loss in fuel economy?