It seems that people are leaving out crucial information when it comes to choosing between Doug's and TTI.... your transmission. If you run a 727, you are forced to go TTI since Doug's will hit. If you have a 904 or manual, then Doug's will work.
i think there has been some threads on the 904-727dilema and i think the conclusion has been that dougs fits with the 727 as well, and im not 100% sure but i think dougs has there problems with manual transmissions clutchlinkages as well but im not entirely sure