So i bought a set of RC's from a guy, he said they were high impendence. Is there a way to make sure? Or am I just better off running with a resistor box just in case? heres a pic of one injector. for a k20a2

 

Use a multimeter and see how much resistance flows between the contact points. That will answer your question.

Or look up the part number.

Also if you're putting 440cc RC injectors in an a2 motor, why wouldn't you just get the RDX turbo injectors? THey're plug and play, they have a better spray pattern, and they're cheaper.