What does 2+2 equal? If Lexus is doing the math, its newest model could be the answer.

Toyota Motor Corp.¡¯s luxury division is finalizing a production version of the LF-LC concept car revealed on the auto show circuit four years ago. Lexus has lacked a 2+2 sports coupe ¡ª with two seats in the front and two small ones in back ¡ª since its SC models ended production in 2010.

Plugging this hole in the lineup fits with Toyota President Akio Toyoda¡¯s vision to transform Lexus from a maker of reliable if staid luxury vehicles into a brand that elicits passion and emotion. Sports coupes also tend to put a premium on reducing weight for better performance, so a production version of LF-LC could justify Lexus¡¯s in-house work on the light and strong but expensive carbon fiber used on its $375,000 LFA supercar.