EFi was only produced for the 1990 run of MK4's.

I guess I should have asked more on your requirements. If all you're after is a standard power ERST engine then buy one ready converted (EFi or MFi) just make sure it runs and idles well. If you plan to go through it from top to bottom anyway it will be already fitted with 99% of what you need, you may just choose to upgrade and replace bits and pieces.

Mine runs low boost in comparison to the spec, and it's fun enough until I fit some more safeguards to allow me to increase the boost. When I first got my ERST it was running standard power, but it was still fun to drive as the big T3 makes it quite laggy, but punchy.

Lee