^^^ What he said.

You would prolly have to hook up a laptop to the guardian and reset the base program type for a rsx-s and let guardian re-learn, but aside from needing access to a laptop for 15 minutes or so, your good to go! ;)

As of now, guardian is designed to work on ALL K-series motors/ecu's with full intent to expand compatibility asap beyond just k-series cars.

Eric