we have a 9600 with a 456 w/ a p-pump and a twin disc clutch ..... makes for one sweet field machine! dont use it to chop corn anymore cuz we didnt want to be replacing chopper parts. on the pulling track it take a pretty good runnin IH to beat it. it has been a couple years since i have had it at the track but i want to get it out this year. i have only played with the fuel screw so far but i want to put boost and egt guages on it and bump it a little more ... it also does very well on fuel while working in the field.