LAS VEGAS -- Mazda makes a big deal about how light the 2016 MX-5 Miata is, and with good reason -- the featherweight is a boon to the roadster's overall performance.

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For the 2015 SEMA show here, Mazda has made the roadster even lighter with a pair of concepts that shave even more mass in the pursuit of performance.

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First is the MX-5 Spyder, which ditches the mechanical elements of the retractable top in favor of a stretched bikini-style cover.

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The Spyder's bikini top was developed by the American Sunroof Corporation with the fabric supplied by Haartz.

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The stretched fabric connects to the windshield hoop at the front using the stock ragtop hardware and locks in at the rear beneath the trunklid.

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Peek beneath the bikini and you'll see a custom tonneau covering the opening left by the stock roof's departure.

It also appears that Mazda has eschewed the MX-5's side glass for additional weight savings.

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The interior is treated with a Spinneybeck "Prima" natural leather upgrade, which lends a vintage aesthetic to match the minimalist exterior.

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The body gets slathered with specially formulated mercury-silver color paint and accented with a carbon fiber aero kit.

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The front grille is also a custom job and features integrated driving lights.

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Lightweight Yokohama Advan Racing RS II 17-inch wheels save a bit of unsprung mass and hide custom-painted Brembo brakes. The rollers are shod with sticky Yokohama tires.

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Mazda's second concept takes an even more extreme approach to reducing the MX-5's weight.

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Dubbed the Speedster, this MX-5 concept is more than 250 pounds lighter than the standard MX-5 Club.

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Mazda, again, starts by ditching the folding soft top.

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In its place, there's a double-hump tonneau that smooths out the roadster's aerodynamics.

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I'm told that there's storage for a pair of helmets and two sets of goggles beneath the carbon fiber tonneau's humps.

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Next, Mazda ripped off the MX-5's windshield, smoothing over the gap with more carbon fiber.

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The Speedster's doors are carbon fiber as well, but painted to match the body's custom blue ether color. Frankly, I'm surprised Mazda didn't skip the paint to save even more grams.

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The grille is a minimalist piece with the word "Speedster" molded in.

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An adjustable coilover suspension lowers the roadster by 30mm (1.2 inches) when compared to stock.

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Custom 16-inch Rays Extreme Gram Lights wheels fill the wells and are shod with super sticky Kumho Ecsta racing slicks.

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Inside the cabin gets a makeover to match the spartan exterior design, including custom carbon fiber Mu-Len Delta seats, Alcantara trim, and a total deletion of the dashboard infotainment.

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In place of the Mazda Connect infotainment knob, the customizers have installed a large "Engine Start" button. The center console has also been wrapped with leather.

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Not even the side mirrors could escape the lightening. These units are smaller, lighter and more aerodynamic than the stock safety equipment.

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When all's said and done, the MX-5 Speedster tips the scales at just 2,080 pounds (943 kg). That should boost performance nicely, even before the slight horsepower boost provided by the Racing Beat center-mount exhaust.

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