On my IS300 I had 12/10. Way too soft
Then I put on some 14/12 springs. Still too soft.
After that, I sold those coils and got some custom valved for 20/18. I was happy with this.
I suggest just selling your and buying some how you want them.
I also suggest getting swaybars if you don't have any. I ran the TRD Yellows front and rear. Loved them.
Also, Fuck MY.IS.
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