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Message: [QUOTE="TARM, post: 1425377, member: 578"] I would be more worried about the trans than any singular part of this. The SD trans go out just from a chip upgrade in a otherwise totally stock setup. I would go with * 160/30 injectors * 910CC VS These are needed with the use on stock spring they are likley barely holding pressure in the 60s psi range. * change the push rods while your in there. * whatever turbo is the best these days with high durability. * built 4r100 and TC *intercooler whatever you can do space wise or the super easy answer with a bit more regular maintenance would be water injection. Honestly water injection is so easy to setup space wise. Really how bad is it to fill a water jug say once a week. After all you will have plenty of space for a large one in a RV. But either way it would be very helpful for durability to have cooling of some sort. *GHA Matt's tuning Then there are smaller supporting things: Redo the fuel system. Change out all the lines with JIC PL hose or bend your own metal lines. On the tank end you can use compression to JIC male fitting. Install a spin on water sep pre-fuel pump and a low micron HP primary filter post pump. Get rid of the bowl and install Y into rear and exit to the reg front to tank return. Install a new oil cooler as the one is likley at least partially clogged and cooling is critical on the Van setups. Having not mess with van personally not sure if the 6.0 trans coolers fit but it they do it would be mandatory upgrade IMO. Being a RV what rear axle does it have? If you going to be swapping things the newer 110s out of the 05+ 550s would be a improvement especially with towing on grades and the extra power. Up front not sure how different the axle setups are but you could upgrade to the super 60 from a 05+ 550 yet still use the 350 suspension and that would get you much larger brakes. Again not sure what changes they did for RV setups so you would have to check. [/QUOTE]