im looking for an ecu for my 91 turbo....when i bought the engine it didnt come with one......preferably just an inexpensive stock replacement.....anyway im open for suggestions

Best bet is a forsale add; buy a used one from a member

try to find a halteck... i know its not a stock system, but as you do more with your car, later on, you'll wish you bought one.

Is this engine going into an s5? if the engine is going into another car other than s5 you will need the full harness to operate with s5 ecu.

first lets hear your plans for your car so we can try and save some money for ya