Probably be fine in the rear, but I think the front will need more back space, 4 1/2 - 5" to keep from rubbing, unless your car is high in the air.
HTH, Jim
I have 245/40/18 on 18X8 4.5 BS in front and lowered some with no problem. I would swear by the way it looks (how deep it sits in wheel well) that 4" BS would work fine, but can't be sure, and of course 4" is a huge drop
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