. . "Flat-six" . . . . . . "Flat-6" . "flat six" . . . "H6" . "F6" . . . "near-perfect vibration mitigation" . . . . "flat-6" . "Flat-six engine" . "Flat-6 engine" . "6-cylinder" . . "Flat-six engine" . . "six-cylinder, horizontally-opposed layout" . . . "flat-six" . . "flat 6" . "flat" . "B6" . . . "flat-sixes" . . . "flat-six engine" . . "six-cylinder" . . . "flathead six" . . . "Flat 6" . . "Flat, six-cylinder" .