but to answer your question directly... you should call tuning shops in your area or stop by and pick their brain. they will either sell you the gear, refer you to someone who will, and point you in the right direction. they will employ spe******ts who will likely be happy to talk to you about...
you can call them to see what they can do. i am not convinced that ff2's can accommodate really stiff springs. they adjust rebound and compression at the same time. ff2.5's give you 2 way adjustability, ff2's don't. with 2.5's you can create a bias between the two. I really wouldn't bother...
snydas1987- yes you can swap front to rears. i did. you need to have dampers that can control them though. i took mine off a week later because it rode so rough and i can't afford 3way adjustables. i was on 18k/12, but ultimately settled on 14/6. it was a good compromise as it is my daily...
coilover springs are easy to get. 2.5" (63 or 65mm) inner diameter and 180-220mm length is pretty standard. i got 3 sets off ebay to play around with. can also get online from skunk2, ksport, calling megan, calling emusa. you can swap for shorter spring and lower your car even more when...