In this list of best Mazda Miata engine swaps, we’ll examine options with DIY kits and easily sourced donor engines. As tempting as putting a Hellcat engine into a two-seater convertible sounds, it’s not realistic for most folks.  The easiest Miata engine upgrade involves swapping the older 1.6-liter for a (slightly) more powerful 1.8-liter Miata powerplant. According to Top Miata, the 1.6-liter inline four-cylinder available in Miatas from 1990 to 1993 made 114 horsepower. In 1994, the new 1.8-liter
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