There are superchargers available for the 4.0L in Austrailia. Unfortunately, they won't work in our 4.0L because or ECU problems. The only way to go would be a custom setup.
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'91 300ZX TT
'92 Camry V6
'73 Celica ST
Yah, I got that message too. I believe there is a Japanese Turbo available for the LS. I saw this picture of a LS400 with a Apexi Intercooler, which is what makes me suspect there is a Japanese Turbo kit somewhere.