Another vote for BBI here. After reading this forum and a few others it became clear BBI was a solid choice. I am running reman 1s. If you do injectors, I would recommend starting with the tank and ensuring you can a clean system providing fuel to the injectors. I replaced mine at 415k, original sticks, and wow what a difference it made. Now w FASS, MM3 and BBI injectors, she runs better than ever.