the 350z trans won't fit in an IS300... the trans tunnel will need completely cut out and widened - its doable for sure, but you won't find many if any that have done that.... R154 fits no problem, V160 fits no problem, etc...
-cody: maintenance forum moderator
2001 Lexus IS300 - 650whp/610wtq (Virtual Dyno)PTE 6765/AEM Infinity - Auburn Sky Pearl (1 of 1348)
2007 Lexus GS450h
2010 Lexus RX350
1998 Lexus GS300 - 1jz-GTE swap
1999 Isuzu VehiCross 285/75-16 Destination MT's - Astral Silver Metallic (1 of 1021) (for sale)