So with an NX kit with a WOT switch, what is different between it and Zex safety wise? Doesn't zex have a module that will stop you from leaning out? Yes I plan on learning how to use nos and be careful with it, but I am doing this on a stock 420A, and I can NOT have any amount of downtime (need the car to get to school/work 7 days a week). When I get around to ordering this next spring (dont' feel like spraying on ice lol) I'm going to see what's available price-wise and if anything new has come out for either brand, as it's definetely between zex and NX right now.