Hello I have the escort mk4 1.6li Ke-Jet. So since there is also the identical xr3i I thought I could only get the control unit from the xr3i and install it in my 90pser because the xr3i has no kat he would have to have a different field of knowledge and then also another mixing formation to the 105 ps. So who has experience with it? (kat is no longer available with me)