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Ok, I bought a set of Nitto 555 extreme tires for the rears on my 04 coupe. The front still have the factory Goodyear run flats. The problem I am having is the backend of the car feels lose. When I put my CCW wheels and tires on its solid. I have two sets of wheels and tires and was planning on taking the factory wheels to the track this weekend.
I checked the air and it was a 30 psi which is what the car calls for. I added 2 pounds of air and went for a drive and still the same. Could it be because of the run flat and non run flat mix??? I need any ideas you 'all have. I leave Friday morning for the track.....