Originally Posted by
FC3Cturbo
What has been rewired? Like it has a "custom" harness for the stock motor and ecu? The easiest way I see you getting it running perfect (if the compression of the motor is good) would be to just buy a new *used* non-turbo s4 emissions harness (engine harness ). Swap in the appropriate electronics including a s4 boost sensor (n326 or equivilent) and you can run the s5 intake manifolds with no problems. Basically the only thing you would be using that is from an s5 would be the upper and lower intakes.
also needs the AFM that matches with your code ecu. and the motor seems to be a s5, look at thermostat cover its plastic. im sorry to say this but you got a long road ahead of you. you definitly need a clutch fan and a shroud. or go efan.