I've looked at puting Nitrous on my 2001 4.6 F150. So far what I have found out is that no one makes a dry kit for the returnless setup. Nitrous Express does make a good wet kit. Both Edelbrock and NOS are supposed to be coming out with a dry kit for the 99' and up 4.6, this spring. I don't know the shots available, but I'm guessing up to 75?
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