Hello, I have a bad number 6 injector which I am planning on replacing and have two questions. First, what is the best brand of re-manufatured stock replacement injectors? There are many (Sorenson, Kardon, Borg Warner, Diesel Tech etc) and it's a crapshoot I know, but I'm looking for one that has fixed the spool valve issue. Second, will only changing one injector skew the contribution of all the cylinders very much? Thanks for your help.