supercharger kit do available in the aftermarket... this vr much depends on whether u wanna go for it or not... be reminded, the fc gonna be killing...
VS is voltage stabilizer... it is used to stabilize ur battery voltage...
estima drifting??... there are lots more than jz increasing ur engine performance to make ur estima drift.... the vr main stuff, ur suspension and antiroll bar must be vr stiff.... this can reduce ur ride comfort to nearly zero... not to mention, u need an LSD rear diff and so on.... dont be insipired by anything too ambitious... u need to put in alot of time, effort and money in....