Did'nt know there was one for the 8V unit.

As yours is a later 100 yours will be a MPI (multi point injection), So open the bonnt and the ECU is a silver box mounted on it's back on the far right just above the battery.

 

I've heard bad things about these, is it a real one or a cheap one that cons the engine to think its cold and over fuels it. It wont feel any faster and your do a very poor MPG.

If your car hasn't had a full service for a while, this will help restore it to the factory level of power.