Mazda redesigns its 2-dr sports car for 2006 retaining 4-cyl power and the general design that helped make Miata the world's best-selling two-seat convertible. U.S. versions of this 3rd-generation Miata adopt the MX-5 name used in other markets. Compared to the 1999-2005 Miata, the MX-5 is 2.5 inches longer in wheelbase and about 1.6 inches longer and wider overall. Base curb weight increases by about 50 lb. The sole engine remains a 4-cyl, but it's a 170-hp (166 with automatic transmission) 2.0-liter vs. a 142-hp 1.8. MX-5 comes in six models. Manual transmission is standard and is a 5-speed on Club Spec, base, and Touring models, a 6-speed on the others. Optional on Touring, Sport, and Grand Touring is a 6-speed automatic with steering-wheel shift paddles. The previous automatic was a 4-speed. Side airbags designed to protect both head and torso are standard. So are antilock 4-wheel disc brakes. Traction/antiskid control and a sport suspension are available. MX-5 comes with a manual-folding soft top with heated glass rear window; a removable hardtop is optional.