yes, it is plug and play. one connector to manifold sensor and another to turbo pressure boost sensor. but like I said earlier, I installed the Ultimate which was supposed to give 65HP, instead I felt the car lost power drastically and the CEL came on and stayed on. we thought it was gas problem because I don't have anything higher than 91 octane locally, so we adjusted down to the lowest setting which was equivalent to stock. yet again, no power gain and CEL stayed on.
I have nothing bad to say about RC or their product as they are very popular for BMW, MB, Audi and VW. it's very well made chip, however the particular one I had just didn't work out. customer service was good, helpful. I got refund with no issue.