Airgap Mod when using EFI

I remember seeing a thread or post somewhere with the need to remove the plenum between to two bores when using an EFI system. Looking for input from EFI users with airgap intakes. Did you need to notch the plenum? If so how much?

Im running an airgap and will be installing the sniper this spring.

I've run the Sniper on my airgap without any modifications to the plenum for a year and haven't had any problems with it. I asked about using spacer on it before I installed it and they did not recommend it, although I have seen that some people say they do recommend it..