Intake manifold
 

Is the intake manifold the same on a b18b and a b20?

Are you asking if they will fit? Yes, they are interchangeable. But the B20 typically comes with a high manifold. Usually if you plan on doing a B20 swap into your Integra, you just keep the stock B18B IM.

^^^ditto

CHEERS vince,
the project is on the way...