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The zex kit is sold as a GT kit, but i believe it fits the 4.0 without any modifications. Several of the site sponsers have the kit including lethal performance http://www.lethalperformance.com/pag...t-nitrous.html
I wont use anything besides nitrous express. NX kits are reasonably priced and easily upgradeable just be sure to stay under a 75shot on a stock motor. I think thats what others have shown to be the safest.