Sales in the US began in March 2006 , with the initial lineup including the GS 300 ( GRS190 ) , featuring a ULEV certified 3.0 - liter 3GR - FSE V6 engine .
The GS 430 featuring the 4.3 - liter V8 .
Sales in the US began in March 2006 , with the initial lineup including the GS 300 ( GRS190 ) , featuring a ULEV certified 3.0 - liter 3GR - FSE V6 engine , and the GS 430 featuring the 4.3 - liter V8 .