rickoff's , Bob Boyce converted his with a simple brute force Hydroxy booster, but you can get almost as good (i am told better) by doing what the guys for silicon chip magazine did so look for (its an Aussie mag) silicon chip and try to contact these two guys

Performance electronics for cars--Mag
silicon chip--Mag

julian edgar
john clark

Ask them about the modification they did on their Prius they got better then Bob boyce with out a booster just by tweaking, so imagine both systems. Rickoff, thats a good attitude, don't be satisfied till perfection, you can get more

Ash