Hi gents, first post here ;-) I'm doing an overhaul of my 360 suspension with fresh ball joints, silent blocs, steering rack ends, etc. It's a 2001 car on standard suspension, tyres are size 215/45/18 and 275/40/18 RE050A's with 32psi all around. My driving is mainly fast road and some track (2 -3 times a year), will drive around 10000 km per year. Although the standard suspension works OK, I wouldn't mind if it would be a bit firmer. Now, I can get my hands on a set of used challenge springs and dampers. They are not the adjustable Motons, but the Boge with P/N 181400. Someone has experience with these on the road or on track? I assume these units are rebuildable? Anybody to confirm? The springs look like standard dimensions, so we can tailor those. Thanks in advance!