I would bet all your questions would be answered in those other threads, but I went with Eibach because a spring is almost always a better choice. My installer laughed when he saw the Westcott. Eibach was easier. Got red springs in rear as a bonus. Rides great. Stance is great. Able to run 285's easily with stock wheels. With that said the guys at Westcott were great to talk to, but the springs were a much simpler install.
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