An available 6-speed automatic transmission and a new performance model highlight Mazda's 2006 midsize car lineup. Mazda 6 models are grouped under "i" and "s" prefixes and are joined for '06 by the performance MazdaSpeed. The i and s versions come as 4-dr sedans and hatchbacks; wagons are offered in s form only. The i and s models have front-wheel drive. MazdaSpeeds are sedans with all-wheel drive. The i has a 160-hp 4-cyl engine, the s a 215-hp V6, MazdaSpeeds a 274-hp turbocharged 4-cyl. The i and s offer a 5-speed manual transmission or an optional automatic--a 5-speed on i models, the new 6-speed for s versions. MazdaSpeeds come only with a 6-speed manual and include a sport suspension and specific trim. ABS and traction control are standard on all. Front side airbags and curtain side airbags are optional for base i sedans, standard otherwise. A navigation system is available on most models.