When I was doing some research prior to ordering I want to say they are coming in the 2 ohm range ... I saw a few videos with them at 2.1 and 1.9. ... so right about there... Now I have seen a 1.5 ohm kit being sold at a site when I was researching my purchase I would link it but I am unsure of the rules here now a days.... --- Anywho I would start low and work my way up to find the sweet spot.
Let me know how yours is going I should be getting mine Tuesday (tomorrow if I am lucky).
GL