i want a chip for my s2 but dont want to spend hundreds getting 1.my car is an 1989 s2 90 spec with the knock sensor,cant remember what colours it is but its not hearts and diamonds,its red and black squares.i have found 2 s1 blue red blue ecus close to me with turbosystems chips.can i take the chip from the s1 ecu and use it in my s2 ecu?or will the knock sensor facility cause a problem?also the chips are both turbosyatems,1 is a silver top and the other a blcktop iirc,anybody know the difference?ta,lee