hi Billy
this could have been done in a number of ways, it could be done with:
- throttle-stop bracket
- modified throttle position sensor
- restrictive washers in the injector bodies
- ecu reflash (remap)
without knowing exactly what kit has been fitted and how it's just guesswork
*disclaimer: if you haven't passed the appropriate tests before removal you potentially invalidate your insurance, leave yourself open to criminal prosecution etc. etc.