What is needed for SEFI???

Taking the emissions gear off isn't a good practice for street driven cars. Removal increases the likelihood of drivability issues and makes it illegal to resell the car (violation of Federal law). All the emissions equipment except the cats shuts off at WOT (wide open throttle), so it doesn't cost any HP on a street car. Some non-functional or missing emissions equipment can cause the engine to run in limp mode, which hurts performance.

If you are building a race track only car that isn't street driven, go ahead and remove the emissions equipment. You should plan on having a custom chip burned to clear any problems the computer may have with the emissions gear not being there and functional.

Find out what the computer does and how it works before you go yanking stuff off just because you heard somewhere that it hurts performance. You may have gotten some bad info...

Here's a book that will get you started with how the Ford electronic engine control or "computer" works.

Ford Fuel Injection & Electronic Engine Control 1988-1993 by James Probst :ISBN 0-8376-0301-3.

It's about $20 from Borders.com see http://www.amazon.com/ . Select boo...very good, and I found it to be very helpful.