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think the GT flares on just one end look goofy.
I'm of the same general opinion, as well. The GTs only on the rear don't look visually balanced without the corresponding bulge at the front.
As to the argument that you need to have similar sized tires front and rear for handling balance, it's just not true. There are many factors that go into what will work for a particular car. My car puts down a boatlad of torque and even with 225s on the rear and 205s front, I get a good amount of power oversteer anytime I want it and virtually no understeer until I begin to drop the front tire pressures.
Remember that Boxters and Caymen (Caymans? Caypersons?) have different size front/rear tires and only suffer understeer when they aren't set up right. Their weight ratio is identical to ours and I'm thinking the Porsche dudes put the bigger meats on the back for a reason. All the new cars have a lot of understeer from the factory as their default set up, but that can be fixed pretty easily.
my $.02 on the tire issue.