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I don't have the exact spec for the wheels. I asked GMG this question before but they simply said it's the same spec as the OEM GT3 RS wheels...
I inquired with GMG regarding their 20" 130R wheels. I asked them about offsets and weight and I received a similar response, which was, "...[our offsets] are proprietary information. All I can say is we guarantee a great fit."
This turned me off a bit, but all the pictures I've seen, including yours, look BAD A$$!
On the other hand, I want to go with a slightly larger wheel, both front and back, and I want to keep the weight the same as or less than stock to maintain or improve performance.
Were you able to get any weights from them?