EVEN BETTER WITH A SIX-SPEED

Has it really been 10 years since Mazda reinvented the classic British sports car? Ten years since igniting a roadster revival that's still spawning new models? Yes, it has. And the fact that more than half a million Miatas have since hit the world's highways proves the concept was indeed a good one. So Mazda is celebrating these milestones with a commemorative model dubbed-appropriately enough-the Miata 10th Anniversary Edition.

But while most such "special editions" amount to little more than not-so-special paint, floor mats, and maybe a decal or two, Mazda has gone the extra mile by making substantive hardware upgrades. The most significant is a new six-speed close-ratio transmission that really sweetens up the Miata's already lively, communicative driving experience.

First gear is a bit shorter than that of the standard five-speed, and the rear-axle ratio is taller (3.91:1 versus 4.30:1). Fifth gear now becomes 1:1, with sixth being the overdrive. This allows closer ratio spacing between first and fourth, meaning less rpm drop-off as you're going through the gears. Another benefit is slightly more relaxed cruising-rpm at 60 drops from about 3200 revs to an even 3000.

While the power output of the 1.8-liter DOHC four is certainly appropriate for a sporting roadster, you won't confuse its torque curve with a Viper's either. So the new tranny really helps make the most of what the engine has to offer. You'll be shifting more, but that's okay: The Miata's stubby gear change is quicker and slicker than ever, so rowing the box is part of the fun. Performance from 0 to 60 mph improves 0.4 seconds over the five-speed version.

Mazda raided its own parts bin and poured the best of it into its Miata birthday cake. The suspension tuning, adjustable strut tower brace, Torsen limited-slip differential, and high-pressure gas-charged Bilstein shocks come from the Sport suspension option; Michelin Pilots over polished 15-inch alloys complete the handling hardware. The Appearance Package's front air dam, side sills, and rear mud guards also are standard.

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