Lowering a P30
#2
MBWorld Fanatic!
You'll want to change all of them. It wouldn't look good if the rears ended up settling in lower than the front and you got a nose up look.
#5
MBWorld Fanatic!
H&R springs will be softer than the P30 springs. If you want to lower and keep the stiffness, you should go with coilovers.
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#9
MBWorld Fanatic!