I never had a dry shot, always a wet system 100 shot... not too much. I could do more, but would probably need to upgrade the fuel pump.
It cost close to 1K in labor and parts for everything I had to do because of my setup.
My nozzle is hidden under the engine and goes directly into the intake manifold. That means the top block had to be removed so a hole could be drilled. I did take the opportunity to completely clean out the whole block as long as it was off. In fact, if I was more technically inclined and had the time, I would have ported the whole thing since it was all apart anyway. If I were to do it again, I would take the time to do it.
The cost included $120 for gauges I bought, $100 for more 02 sensors and welding, and also some Iridium spark plugs at $21 a piece (can get for much less, but we were short on time).
Also, add in a $200 Vortech Super FMU ($300 retail). Unnecessary but helpful for tuning.
Part of the low cost is because Larry tends to undercharge for work.
$200+$100+$120+$126= $526. So really, I paid less than $500 in labor for at least three long nights of work... at least 15 hours, probably more. I was the first to have it done this way and he has done a few since, so I'll bet he gets it done even faster now. I was the guniea pig.
The best part was spending the entire time watching and helping as he runs an open shop which I love. I'm always interested an eager to learn so that policy is a big factor in where I choose to go. I don't BS him too much, watch, learn, assist and ask occasional questions. I've spent an entire day there and enjoy it.
There are other ways to do a wet system without going through all that work. Apparently, there is a big benefit to doing it this other way. Someone would have to get an explanation from the source, because I could not explain it without butchering it.
It has something to do with distributing an equal (approx) amount of NOS to every chamber and a very short travel distance.
As I said, the power is very progressive. There is no jolt, at all. I was able to use it in first gear once (hit at 4K RPMs) when testing and had no problems with traction.
We also have a purge valve rigged to eject NOS and air from the driver side intake vent.
In time, since so much is done, I guess it would be pretty cheap for me to upgrade to a 125 or 150 shot and a fuel pump. I don't see a purpose as I wish I had more opportunities to use it as is. If I knew how little I would use it I may have not even spent the money.