Thanks massman and johnny.
I found that forum with the volt mods thread a few minutes ago and was going to start prodding people about the boostermod (one of three words i could recognise in the whole 20 pages lol).
Looks to me like a feed direct into inductor leg right?

http://www.hardware.info/forum/showthread.php?t=138099

Johnny, in your mod is that a 3-phase booster?