I agree with Jared on the ATI convertors, historically they have been the quickest, fastest and most efficient of all the brands that we have tried. As Charlie stated, service and delivery is the fastest around. Also, we have found that only ATI can truly duplicate an existing convertor for stall, efficiency and ET/MPH. My ATI convertor currently stalls 64-6600, depending on weather/track conditions. We don't run the best 60's out there, but they aren't too bad for a 3630 lb SS/DA (best of 1.249 in 2007, 9.33/141).