Dudeness the Hawker I flew was a 1AR, with the Garrett engines in place of the Vipers. It was an old one, sn 075. The engines were the same as those used on the 700 series, but at a MTOW of only 21,500 lbs as opposed to the 25,500 lbs of the 700, the performance was decidedly more sprightly. Part of the mod was the installation of a second rudder bias strut, and I seem to recall two were required because of the increase in thrust over the Vipers. In any case, they were a no-go item. I may have exaggerated slightly about both feet flat on the floor, but only
very slightly.