i have a s4 turbo 2....i plan to put an s5 engine in it, will the motor work with the s4 harness and drivetrain?

 

yes

 

i know i would have to use the s4 tps since they are different...can i also use the s4 injectors with that engine?

 

yes. might wanna swap the front cover if u wanna keep the omp. s5 is electric s4 is mechanical. use the s5 intake manifold. some people think the s4 turbo main is better flowing. and the s5 turbo mani has a better wastegate hole so u could port the s4 and be all set but like i said people think its better minus the wastegate