The 96 ek is obd2, so that really doesnt help. This is the second thread youve had about this in a week. I told you on the other thread. Use the p13 if the motor is stock. It will be easier/cheaper. You said you have a p28 virgin/unchipped. If your motor is built. MEANING upgraded pistons(low compression/high compression), is turbo or supercharged. Youre better off having your ecu socketed/chipped with a basemap for your application. Then bring the vehicle for someone to tune it.
There are no shortcuts if you want your motor to last. Specially if it is high compression like you said it was on your other thread.

Do we still have mods somewhere? why is search not working GRRRR!!!