I considered this approach but ultimately sold my KW-CS and went with MCS.
I agree with the recommendation to use 5.5 rear springs.
Hyperco is the only one that I'm aware of that makes this size. Swift make 5 &6"
5.5 gives you that extra travel with less chance of coil bind at full compression.
You probably have enough space to keep the helpers up front with a 6" spring
However helpers don't do anything except keep everything from hanging loose when to lift the car.
On most COs all helpers do is limit height adjustment.
I ordered my MCS w/o helpers.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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