i use the perma cool listed 19114 and i built a shroud around it , ok i'm using a fluidyne radiator too
i mostly cruise @ 160-170 a little chilly but thats cruising temp m 50-60 mph la la la type driving
once you start stepping on the pedals the temp adjusts .i use an electric sender temp gauge . the stock gauge sucks big time
http://www.ddmcse.com/turbo/images/SANY2150.JPG