I was just informed that all of Isky springs are PSI, way to go Isky. I've bought a couple sets from a top NASCAR team, that are all PSI and i'm told that's all they use. The springs i bought have 400 laps on them and the spring pressure checked out as new at the installed height. Now i'm not suggesting that you buy used springs, but i've bought these springs at the most of $42.00 per set, will i run them, you bet i will, Devil beware, i'll be at the track with them. That's my story and i'm sticking to it.
Zip.