Last year I bought an E-Bay chip "A BMW Performance" #990 ECU 92-94 "Innovativeautosports.com.
When I installed it on my 1993 318is the performance improvement was very noticeable. Unfortunately, the check engine light would not go off. I sent it back & got annother. Same thing happened. Since I don't want to run with the check engine light on, I never used it. The seller asured me they have sold many of these with out my problem. Since, they did replace it once, I believe them.
Maybe it will work for somebody else with the same ECU number. If anybody wants it, I will mail it to them. If it works, they can send me $25.00....if it does not they can mail it back. E-MAIL me off site.
Too bad...because it made a good improvement on performance...it also raised the limiter to 6900 RPM (middle grade gas needed)