100% meth = massive corrosion of all the aluminum parts it comes in contact with, but the power increase is mental
it is very very very slow corrosion rate and it only injects over 11 psi so it cleans itself lol.
Just keep an eye on everything. This is what 50/50 mix did to a 1.8T's intake valve guide after 5k or so:
Was burning 2L of oil every 500 miles!
I will only ever run 75% water and 25% meth on cars I fit it to.
(Sorry to clog your thread Mike)