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Are the 4 tires matched? Never mix tires on a performance sports car.
How many miles on the new tires? It takes about 200-500 miles to scrub off the mold release tire manufactures use in production, this was covered in the product information you received with the new tires. Did you read it?
I suspect your tire pressures are low. Your cold pressures should be more like 32 front and 36 rear.
Were the tires road forced balanced? Alignment completed?
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