Hey Noah, I saw your PM, hope you don't mind but I am just going to try and answer them here so that anyone else that might have the same questions might also get them answered.
I didn't do a write up on my kit besides the posting of the entire parts selection and terrible paint drawing a few pages back. My setup is a little unique in that I already had a big water tank that was fabricated for the A/W intercooler and windshield washer tank. It is around 5 gallons. I also did not use a water/meth spray controller because I am using the standalone Haltech and it can be programmed to trigger the relay when I want the pump to fire.
In a more traditional setup you would have a plastic tank of some sort probably around a gallon or 3/4 of a gallon, it would only be for the water/meth system. In that tank you would have a low fluid warning LED that would be wired into the cab (I don't have this as I have a huge tank I just check at fuel ups. I haven't used even a 1/4 of a gallon per tank of fuel). Most water/meth kits use push on tubing, I wanted -an 6 line, so different there, I also wanted an inline filter because I have a lot going on in my tank.
For the TRD system like you have, I would recommend a complete ready to go system. A place like Snow Performance has setup some nice kits. One that would work well with the SC is:
http://www.snowperformance.net/stage-2-maf-boost-cooler.html
You would wire it into your MAF sensor and you could adjust the spray based off of MAF voltage. The Snow performance setup does progressive spay so you could do maybe 30%@2v, 60%@3v, and 100%@4v+ just make sure that you use one of the smaller nozzles. With a positive displacement blower you are always making boost even if you are not positive manifold pressure so their other kit that is tuned off of manifold pressure might not work as well for you.
The other thing to remember is that since you are not looking to substitute methanol as a fuel and are just looking for the water/meth to be a cooling agent the exact and precise tuning is not needed. Additionally if your system fails for some reason, you won't be looking at catastrophic engine loss like the guys that are pumping huge amounts of meth and pushing the timing and boost up. The nozzle that I am using is between the Snow Performance #2 and #3 either would work well.
Now for your need to remove it for inspection, yes you could do that very easily. The only real modification you would need to make would be a way to thread the spray nozzle into the airflow after the SC output before the throttle body, I would assume you could find the same size plug and just thread it in when you pull the nozzle out. I am not sure how picky they are about the other components as long as the nozzle was not connected I would think everything else could stay?
