Sean the diamater would change when I had the Porsche wheels, they were 16s and overall with a 40 profile they were a tad smaller, with the 17s they will be a bigger diamater than the 15s.
But for a vr6 with lowness and this is also on Coilovers:

But for a vr6 with lowness and this is also on Coilovers:


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