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this link is still good: http://www.autoweb.com.au/cms/A_55446/newsarticle.html
"A supercharged three-litre VVT-i equipped all-alloy Quad Cam V6 engine powers Toyota Australia's first in-house concept vehicle - the most powerful engine ever fitted to an Australian built Toyota.
Its supercharger, sourced from Toyota performance equipment specialist TRD USA, is belt driven by the V6 engine's crankshaft."
So like I said 2 years ago, TRD has a supercharger designed for the 3.0 V6 VVT-i. They're just not sharing it.
Nope, new developments, not even for the second gen. RXs. Only existing type of supercharger for the RX300 is the TTE Compressor. There is a Supercharger from a company called Delta for the 2nd gen RXs, but that's about it.
Bringing this way way back form the dead in case anyone is interested. I am currently making an adapter plate to use the 1mz vvt-i throttle body on the non vvti 1mz TRD S/C