CHOPPING SPRINGS...

I don't think you can do it mate as your springs are pigtailed.

Either way do not do it on the car, they will be under compression and you will have a very nasty accident

A couple of well known members have chopped their springs on the car.

Whilst some may claim it is safe (an in some instances it probably is not too dangerous (I.E when the spring is not compressed at all) I would still take the springs off the car in all honesty if you are chopping them:).

if you have to ask then cut em out the car if they aint pig tailed at both ends, otherwise just buy some springs,.

Double pig tailed, and a right horrible job to remove, I made a compressor to remove them, as the normal type compressor I had would not go around the spring.
Cutting double pigtails is nigh on impossible as they get bigger towards the centre so if you cut them the spring wont fit in the cup, MOT fail and potentially dangerous if the spring slips off the cup. Buy aftermarket ones, much much safer,

It's not cutting them on or off the car that is the issue, it's doing under load that is the potentialy dangerous bit

As for ride quality, ANY lowering spring WILL stiffen teh ride. This is obvious as the suspension cannot travel as far before things start bottoming out!

I've done it both ways, My old W201 190E had proper lowering springs and my current W124 300CE has had 2 coils removed all round. Both had low profile tyres (45's on 17's and 40's on 18's) and tbh I'd say the 300CE still rides better.

However, if your car has double pigtailed springs (I'm unfarmiliar with BMW's) then all the above is pointless as you cannot re-seat them after chopping.

If there's nothing listed for your application, try looking at other applications as you'll probably find something similar somewhere. eg, IIRC putting Corsa rear springs in to lower Astra/Cavaliers is not unusual. (However this may be factually incorrect!)

Yep, springcoil or coilspring in Sheffield, either are happy to do custom springs, I've had loads done.