I have never been able to produce a power gain with meth injection on a M90 setup.
Any gains you make are typically lost in the mess that is making meth explode in your cylinder.
The guys that make power with it are able to push WAY more air in that they otherwise couldnt because the temperature goes up significantly. The m90 already outputs stupid hot air, so pushing a stupid amount more air is not really even possible, and if it was it wouldnt be that much hotter in comparison to the guys that really see gains from it.
Ugg, if you didnt understand it... cliffs:
turbo guys can make ALOT of heat if they spin their turbo REALLY fast.
m90 guys can make alot of heat basically no matter what as they are unintercooled, but they cant spin thier blowers really fast due to physical limitations.
