I have been using an aquamist setup for over 6 months now. Use non-flammable premixed 49%meth with custom tank in boot. Have it connected up to boost and idc. Comes on at vacumn. Also has an in built failsafe. The aquamist is more expensive than some of the others, but is quality. Use 2 injectors just before intake manifold.
Got it more for driving around in our hot summers, but did pick up some power as well- 420 to 450rwkw with lots of potential left. Good alternative if you don't have e85, in many ways more consistent and reliable.
When it kicks in I see IAT over 10C less than ambient. Driving around town on a 35C day the IAT can go 50C plus. Soon as the wmi kicks in it drops to low 20's and you sure can feel it. Don't lose power in heat which is what I wanted to achieve.
Its changed my thinking about intercoolers. Just get one that can flow enough. No ic will compete with wmi for lowering iat. If your spending money on a tune it can be cheaper than a mega$ ic.
Have heard that you can seriously increase power with timing and boost with wmi if so inclined.