I have fitted Leda coil overs to my S1, its mainly used on track so have a much higher rate spring that what some of you on here have said, i use 375 front and 275 rear, i had to strengthen the rears, which i did by removeing the old turrets completely and welding in new ones, bigger and stronger with a concentric top mount. its also had bracing added between the turrets and links to the roll cage.

but as has been said above, if i was to do it again i would definatley go for the MEF set-up. fits in with no modifications and is just as adjustable as any other coil over.