Dude, Didn't I mention on Sunday that I had the K Factory spring kit on my E4?
It seems a bit expensive till you add up what they would cost 1 pair at a time.
I'm hopefully picking up the TM kit this week and you can try out some setups at the next race. By the way, the TM kit costs about $10 less than the K Factory but only has 8 pair instead of 10.
There is 3 different KF spring kits. Soft, medium and hard. I got the medium kit. I can't remember the part number though. They are like 21lbs-30lbs.