mocal or setrab are the ones to go for if budget will allow. if you have gone turbo (and drive it in anger) you want the biggest one within reason that you can fit in the given space. if supercharged then you will get away with a smaller unit. As mentioned above, get a thermostatic take off plate, they are beneficial to getting the oil up to working temp in a shorter time which is important. If you use the search function this subject has been covered in some depth and should give some clues to peoples findings on sizes of matrixs...
