If you want to install and have the NA SPOILER deploy at speed, on the SRT, you will have to reach out to Member Rudy Compart.
This will require a remap of the ECU. When I did my conversion from NA to SRT I removed the ECU and sent it off to be reprogrammed.
That’s the only way to get it to work automatically
I’m currently in the process of changing mine from Speed deployed to Fixed wing.