I use a Snow Performance Meth kit mixing at 80%alcohol, 20%distilled water. Works very well. I've also tried adding 8oz Nitro to 2qt of meth/water mix.
Haven't tried on the track yet, but on the street it'll break the rear loose (really loose!) when the boost hits 22 and the meth/nitro mix kicks in, even in OD with the converter locked up. Without the nitro i the mix it doesn't get loose in OD, but it will in third.
haven't yet done the dyno with nitro in the mix.