I got the Jacobs installed at the dealer when I bought the truck. I have 306K and I just removed the 4th vacuum pump from the engine. I also removed the Vac chamber elbow from the back of the turbo. It quit working about 2 months ago. I haven't been able to locate the part. All they will sell is the whole kit at $1100up. I bought a used Super D Celerator on Ebay (USGear) and I can't get any of the installers on the US gear website to install it. They won't handle them anymore because they said US Gear wouldn't honor the warranty and replacement parts cost too much! So, I will probably be getting a PRXB when I can get the money up. Are they any cheaper at the factory? I am in BC a lot delivering RV'S.