So i was wondering if i can run s4 low impedance injectors on a s5 high impedance ecu? Would i just need to keep the s5 resistor pack installed? Please let me know!

 

there is no resistor pack on an S5 you would need to add it

 

You can also run 5w resistors inline with the injector wires, if you dont mind cutting your stock harness. Some wouldn't recommend it, do your research. I ran like this for a couple years with no issues.

If you have the money, buy some new high impedance injectors from Injector Dynamics. Thats the best way to go.

 

Just run inline resistors. Works no problem.

 

Alternatively, if you're dead set on using S4 injectors, the 87.5-88 injectors are high impedance. The connectors are different though, so you would have to modify the harness. But at that point, if you're going to buy injectors, just buy the S5's