[Nismo1997]

If your car already has a Sr20de(2.0) its a derect drop in. You are better off getting your ECU reprogrammed by JWT. Most people get a FMIC, rather then a TMIC

 

[Nismo1997]

Thanks for the help! I really appreciate it!
Why can't i run the Japanese ECU?
Do i change the fuel pump?
Do i need to use the Japanese harness?
Also what clutch do i use, the DE or the GTI-R?

You can use a DE wiring harness which will plug into the DE wiring harness. If Im correct the JDM wiring harness dont plug into the US ECU. If you do the DET swap I would upgrade the fuel pump. For clutches, you can use DE( aftermarket of course)