ever since i got my car it has had a vibration in the front end. they replaced all 4 tires at 500 miles stating that the belts shifted. the vibration didnt go away so the replaced 3 tires at 2500 miles saying they was out of round. the vibration still did not go away and now at 8000 miles im getting 4 more new tires but this time they are putting the goodyear triple treads on it instead of the ls2's. i was wondering if anybody else has had the same ploblem that has the gxp with the 18's on it.