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Mines lowered 25mm I think it is with pi springs and I'm running 16's without too much hassle. It rubs on the back if I've got 2 or 3 people in the back and it sometimes rubs the front if it hits a bump while turning a corner. But it must barely make contact cos my tyres are still mint. Hope that helps a little.
I had Si on 15's lowered 40mm on Pi shocks and springs, I had a slight rub on full lock that I got rid of by trimming a little bit off the inner arch covers.