jdm intake vs. usdm

hey question, how much diffrent flow wise is the jdm intake on a b18a vs the usdm intake? i was lookin at one and it looked smaller than mine? or is it an illusion?

On Civics I know that the opening from the box to the tube that feeds the Engine, the opening on USDM has square edges where the JDM has round edges. It looks like the USDM one but with the sharp points sanded down.

I don’t know how much better it flows. I’ve been the difference isn’t noticable.

-Steve

sorry i ment the intake mainifold

I’m pretty sure the specs on IM’s are the same. The only difference may be JDM IM missing sensors required here in the US.

-Steve