best thing to do is install your avcr first, if you know how to do it yourself then you will save money right there. when the pfc comes, drive it to the workshop/tuner and then replace you stock one with the pfc right there, in which cause would save you more money then having them install it for you in which even my younger brother can do. Its just a matter of removing the old ecu and plugging in the pfc - hence plug n play.