hey mate, I have a 3800 rpm stally from dominello and its sweet as, the only bad thing I can say about it is that it hunts a little bit when ive got the cruise control engaged and im driving through undulating country. in other words, the car slows down when it hits a hill the cruise goes to compensate, it reaches the cruise point and goes to back off but because its a hi stall it takes more revs to hold the speed to by the time the revs increase again its lost the vehicles speed again and accelerates harder to reach the speed again but it over compensatates and then backs off and looses its speed again and so on and so on, to over come this I gently rest my foot on the gas until I reach flat ground. Cant say anything else about the other stallies, havent had anything to do with them, hope it helps Tom