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They are different. I didn't bother clicking the link the first time. I just moused-over it and saw that it was linked to ITP. The OBS one won't come close to fitting where the correct one goes...
I think that the engine does idle a little quiter. Maybe not as much knocking. Some notice more and some notice no differance. It can't do anything but help balance out the high pressure oil distribution to the injectors. Well worth the small cost. IMO
I think it quited mine down as well. At first I didn't think it did, but after idling slowly down my alley, I definitely noticed it was much quieter. I can't wait to get the in-tank mods done as well!! I currently have the CCK in, but have yet to drop the fuel tank to get that all cleaned up...