So for your +38 rims there is a difference of -17 which means that the outer rim edge will stick out by 17mm further than the original CL9 rims. Furthermore since CL9 rims would either be 16x6.5 or 17x7 (depending on whether you have the luxury model or not) so your 8 inch wide rims will also mean they stick out further from the side plane of the car.
Though Im new to all of this so Im not sure if Im correct. Hopefully someone with more knowledge will answer this question soon.
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