have just dropped mine 2" all round ... i spoke to rally design and they recommended 145 lb springs which was with a 2" drop . that said mine is running a 1300 x-flow , tho the weight difference between the two must be minimal i would think . mine rides nicely now on them . must warn you tho my tyres did ocassionaly catch the arch on slow r/h turns , but i am still running 70 profile tyres !! . also have spax adjustables on the front which i had to turn the rebound right up on once the springs where fitted ....hope thats some help !