s5 engine into a s4 body
 

so i wanted to know what all beside the engine would i need to make this swap happen.

Depends on how you plan to run it. Standalone ecu, NA or turbo, what you have vs what you are buying. Too many not listed details to determine.

both turbo swap engines wasnt going to tune it but if it helps the car run better was thinking of getting a standalone ecu but if not needed am good just really want it as a driver car

S4 electronics. S4 ecu, boost pressure sensor, tps, maf, engine harness. S4 throttle body. And use the s5 keg, uim and lim.

Use the s4 electronics on the s5 engine. Look into it and check into how s4 and s5 trailing plugs are in different locations.

Pineapple racing now sells an intake manifold isolator that would likely make it possible to use the S4 NA intake on an S5 NA engine. S5 N/A Intake Isolator

This would make the "swap" even easier.
On a side note, definitely use the S4 electronics. I've wired an S5 ECU into an S4 chassis before. What a nightmare. Never again.

Hope you find this useful:
Triple-R: FC3S Buildup - Chapter 3: Part 26

From my old racecar build.
Regards,
Crispy (Regan)