The BP-4W engine remained at 1.8 L (110 cu in) but received several minor updates. The engine compression ratio was raised from 9.0:1 to 9.5:1 by adding slightly domed pistons; the intake cam was changed to a solid lifter design with a stronger cam; the intake runners in the head were straightened and the intake manifold was mounted higher up. Mazda's Variable Intake Control System was introduced, which effectively gave a long narrow intake manifold at low rpm for better swirl, changing to a short, free-flowing manifold at high rpm for maximum breathing. Power output of the new engine was quoted at 106 kW (142 bhp) with 116 lbf·ft (157 N·m) of torque.
The 1.6 L (98 cu in) B6 engine remained available in Europe and Japan.
The base-model 1.8 L (110 cu in) NB could reach 60 mph (97 km/h) in 7.5 s and had a top speed of 130 mph (210 km/h).
In 1999, Mazda celebrated the 10th anniversary of the MX-5 with the 10th Anniversary Model, a limited edition featuring some until-then exclusive features, namely a six-speed transmission and Bilstein shock absorbers; performance figures were slightly different, with faster acceleration but lower top speed than the standard 1.8 L (110 cu in) NB.
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