Subaru is considering additional US production capacity in response to brisk US sales.

Parent company Fuji Heavy Industries’ CEO Ikuo Mori has said that while capacity expansion is not simple, the firm may need to add capacity if sales continue to grow.

Ikuo Mori told reporters in Tokyo that Subaru’s Lafayette, Indiana, production site had room for further expansion.

Fuji Heavy said earlier it would boost production capacity at the Indiana factory to 131,000 units a year from July, from 100,000 units currently, bringing its global capacity to 626,000 units.

Subaru of America Inc. had its best-ever April in sales last month. The company sold 23,198 vehicles – a 48% gain on last year, with the Outback and Legacy (both made at Lafayette) strong sellers.

Through the first four months of 2010, Subaru sales in the US totalled 80,692 – 41% ahead of last year.