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The ZEX dry kit isnt a really good kit in my research.

it works just like the NOS dry kit, except it only uses one solenoid and lacks the NOS regulator/ mechanical servo to dampen the shock to your fuel system. It also lacks any sort of fuel pressure adjustability. What this translates to is a fuel pressure shock of about 125 PSI initially, then lowering down to the standard 80 PSI. The kit is great for plug n play, but it isnt the safest reguardless of what their media hype says, and is obviously not the most adjustable kit out there.

as far as tuning for it, the zex kit goes in after the MAF, just like the NOS kit, so you will need to tune a little bit. I would drop one heat range in plugs and tighten the gap to about .035 you will also need to bring your timing down. I would pull 4 degrees out just to be real safe, and then dial some back in after looking at the timing marks on your plugs (this is for the base 75 shot)

the fuel story is the only other thing to work with. you will be fine with stock injectors, and the kit should have a jet chart based on stock injector sizes. People always think that with a dry kit you need to go with bigger injectors, but there are a variety of reasons that dont make it nearly as big of an issue as people think. To put it in retrospect, i have used the NOS dry kit for years and i make about 300 HP at the wheels on my stock puny 19# injectors. I have sprayed a 150 shot on top of this out of those in jectors with no problems at all.. thats roughly 450 HP being supported by tiny 19# injectors.
Much over a 100 shot and i would upgrade the fuel pump if its still stock to support the nitrous fuel pressure demands.
 

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Well since I dont like buying new internals.. i retard the timing for even a 50 HP shot untill i can look at the plugs and play with the timing from there.

2* for every 50 HP of nitrous and you cant go wrong.. sure, you can get away with 125, i have even heard of 150 shots on base 10* mustang timing,.. I strongly suggest people be sheepish with timing on nitrous.. start safe and make it agressive. you can always go closer to the ragged edge, but you cant do anything if you go too far and eat some pistons up.
 
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