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Well-timed question... check out the Petrol Ped video from a few days ago (~4 Feb). Looks like Mulgari in the UK used the Eibach spring kit for the F54S to lower that JCW. From some quick searches, looks like H&R springs are also available with the same quoted lowering distance... 1.2" front, 1" rear. Drop will probably be a little less substantial on a JCW since you're already 10mm lower.
Will be interested to see what path you go down... I may follow in another year or so. I love the dynamic dampers and don't want to swap for coilovers, but would like to be a little lower, too.
I lowered mine on AC Schnitzer springs. I have DDC, it was no problem. I put them on at about 25k (km), there was a little shimmy that worked itself out. The ride height is good (I’m in the dead of winter and no problems), they are comfortable and keep cornering tight. It’s probably only a 15mm drop for you seeing as the JCW springs are about 10mm lower than the S.
I lowered mine on AC Schnitzer springs. I have DDC, it was no problem. I put them on at about 25k (km), there was a little shimmy that worked itself out. The ride height is good (I’m in the dead of winter and no problems), they are comfortable and keep cornering tight. It’s probably only a 15mm drop for you seeing as the JCW springs are about 10mm lower than the S.
Helpful feedback, especially re: DDC...that height looks great too (your pic in another thread)
I’m on AST springs from the Netherlands. Zero complaints. I chose them because they were one of the few manufacturers of springs specifically for ALL4 models.
Paired with Bilstein B8s. I have (had) dynamic dampers - no issues removing them either.