yes they are aftermarket.

I dont think its the tires at all because I rotate them every 5k miles and it still pulls. The Tires are multi directional so at every 5k I cross the backs to the from and fronts to the back without crossing. Ive had them on the car for 5 years now. They are at a stage where the rubber looks like it is rotting but it still has tred but, a good portion that I would say with my little amount of driving would last me till Janurary.