 The IS is built on a shortened version of the rear-wheel drive midsize platform introduced for the third generation Lexus GS, and also used on the Japanese-market Toyota Crown and Toyota Mark X.The chief engineer of the second generation IS was Suguya Fukusato, a rally driver.The second generation IS sedans were sold until 2013, when the third generation (XE30) debuted; however the coupé convertible model continued to be sold through 2014.