I dont know spring rates but Ive tried multiple springs for the F22 and imo the dinan are the stiffest you can physically see this be measuring the coil diameter and weighing the springs
HR came in second the eibach and vogtland are last
Dinans front measurred 13.6mm for the front for both RWD and AWD with the AWD being slight shorter the the RWD the 4cyl are 12.8mm
Dinans rear are also the tightest wound they measure 14.4mm the 4cyl are the same mm but a tad taller good for those that dont want the rear rake
the H&Rs have two versions AWD and RWD the RWD are the same for both 6 and 4 cyls and are red in color the AWD are blue
the AWD are 13.2mm the RWD are the same but are wound wider than the awd front
H&R rears measure 13.3mm and i couldnt tell the difference between awd or rwd the coils are more spaced out than dinans and are softer
I would advise in using dinans rear that are part number 0795 and there RWD fronts that are 0790
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