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I would only get the XS if you are planning on running 600 or more. Would save you a few dollars but if you just want to be safe go for it. The nitro is used to fill your tanks so you would just have to get what size bottle you want and a regulator from a welding supply store and run that to your tanks. With the nitro on you will never get below you pressure switch level so the compressors will never come on. I do however run a toggle in the line so I can shut off the compressors if I want. The dual valves will be ran from the tank to the bags up front. You will set one up normal with the fill and dump and the other will have just a fill valve. You will need 10 valves instead of 8 total for this. Then just jump the second fill valve from the first fill valve. Also be sure you get tanks that will give you enough ports to do this. You will need two ports for the compressors to go into the tanks (if you run two) one port on each tank to be connected for balancing of the air between the two tanks one for your nitro input one for your switch four to go to the front bags and two to go to the rear bags. I may have forgotten something there too. Anyway that’s how my car is set up. Four lines to the front and two to the rear. With the regulator you can adjust what PSI you run at. For me just driving around I do 200-250 and when I hit the streets for some fun I’ll go up to 350-450 PSI. If I go over that its just to see if anything will break.

here’s a pic of my setup. The valves you see are for the rear and the fronts are up under the hood. put the fronts as close to the bags as you can. This will make them faster as well as use your aior better. Doesnt make sence to fill and drain a line all the way from the tank to the bag. this way you only fill and drain what you need.