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my local 5.0 shop recomends NX but i know alot of you guys like rygen..scrming and others have been happy with ZEX. The only problem the guy who owns the shop saw was that with zex its very hard to keep your bottle pressure right even with their racers kit? Any opinions on which one you guys would feel is the best? And any pro's and or con's of zex or NX. also where do you guys recomend putting the purge? Thanks again in advance.