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Neil no one really makes springs for Lexus AWD drive cars. Many of the Lexus guys have been using the RWD springs with no issues. A local member with the IS250 AWD has my old IS350 RWD springs on his car and hasnt had issues. I know many other members with the ISx50 have done this also. I am not as intune with the 3gen GS and what others have done. I know its quiet but did you try to post in the GS section to see if anyone one has done it? I am going to guess not with the little modding and cars in this section.