A sedan version of the sporty Si coupe joins the Civic lineup for 2007. Honda's compact cars come in 4-dr sedan and 2-dr coupe body styles, and include a gas/electric Hybrid sedan. Sedans and coupes come in DX, LX, EX, and Si trim. All have a 4-cyl engine. DX, LX, and EX models have 140 hp. Si versions have 197 hp. Hybrids combine a gas engine and an electric motor for 110 hp. The Hybrid automatically runs on one or both of its power sources to balance acceleration and fuel economy. The system recharges itself; no plug-in charging is necessary. DX, LX, and EX models use a 5-speed manual transmission or a 5-speed automatic. Si models come only with a 6-speed manual. The Hybrid has a continuously variable automatic transmission (CVT). ABS is standard on all Civics. The Si models have a sport suspension, uprated brakes, and a limited-slip differential designed to direct more power to the outside front wheel in a turn to aid handling. Front side airbags and curtain side airbags are standard. A navigation system with voice activation is available on EX, Hybrid, and Si.