Re: 185 pulley+ water/meth injection=??
I have used water injection and it lowers the combustion temperature and lowers the tendancy to detonate, preventing timing from being pulled by the computer. It does not make power, just lets you push the motor longer and with limited octane. The meth can help but are going to use a bunch in the course of engine operation on the street unless you have a throttle switch.
Water does assist in removing deposits from the engine interior parts, sort of like adding walnut husks in the huey's turbine engines of vietnam.
Woody