my housemate had WMI on his R33, made some really good results, very impressed, he had the aqua mist kit in his.
He ran a 50:50 mix of water and meth, got the meth in big 25L cubes off his old man real cheap.
Meth didn't last long enough though, few laps around the track and it was empty. (5 L tank). He had a warning light on the water meth tank level though so he could come in before it ran out and he reached ping city.
My favourite part was you could touch the plenum after a hard run and it'd be cool to the touch like it had just come out of a fridge