Rcounts, I wasn't trying to correct anyone. I sometimes don't say things correctly and they are taken wrong. You got, and gave a lot of good information about EGR and ALDA as related to your engine. I just didn't want Biglex to spend a lot of time doing something that would have to be undone. I just wish I had known that the 602 didn't work the way the older engines worked and I would have saved myself a lot of time. I did end up with a non-EGR engine with a non-computer controlled turbo and am very happy with it. It took me about a year of learning, thinking, trying, failure, etc but I finally got there. I was sharing some of what I learned to other 90 to 93 2.5 turbo owners. Keep up the good work, learn all you can about your car, and enjoy one of the best cars ever made.
Paul

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84 500 SEL (307,xxx miles)