TSX drivers finished in 3rd and 4th in the Drivers ' Championship .
Acura returned in 2006 and won the Manufacturers ' Championship of the Speed World Challenge Touring Car class for the second year in a row , running both RSXs and TSXs .
TSXs drivers finished in 3rd and 4th in the Championship     .
Acura returned in 2006 and won the Manufacturers ' Championship of the Speed World Challenge Touring Car class for the second year in a row , running both RSXs and TSXs .