[Showdown]

Perhaps "hide" was the wrong word.... Tolerate, compensate, accept...

CIS is a pretty forgiving system and can run with all sorts of problems. Case in point; the hundreds of CIS Porsches out there that run and drive with little quirks, nuisances or deficiencies, but run nonetheless. Air leaks, pressure issues, WUR problems... the cars my not run well but they run and CIS tolerates it. Take that same car and throw EFI on it and the small issues that CIS can tolerate become major issues for EFI. Sure, you can modify the tune to compensate but that's crappy practice and not the correct way of going about things.

EFI depends on the tune which in turn depends on the tuner. There are countless options and features and tweaks that can be done in an EFI system (regardless of the ECU) and knowing how to work all of those is a lot and it's very easy to start chasing one's tail.

Ask any EFI ECU manufacturer, any tuner, any shop and to a T some version of "you have to have a well sorted car before going to EFI" will be their gospel.

But what do I know, feel free to take a crap funning CIS car and throw an EFI system on it and have at it.