They used the older engine for the Mazdaspeed.
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The United States 2004-2005 Mazdaspeed MX-5 turbo is based on this engine rather than the newer BP-Z3 and produces 178 hp (133 kW) and 166 ft·lbf (225 N·m) with slightly-reduced compression.
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In Australia, a turbocharged version of this engine produced 210 hp (157 kW) and 206 ft·lbf (280 N·m) in the Mazda MX-5 SP.
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At least with the NC they decided to go all aluminum. Still shares an engine with FWD cars, which caused cooling issues on NAs and NBs. Maybe that's been worked out, too, I haven't really looked into the NC much.
When I bought my Miata, I told myself that the maneuverability was its best safety device, but after witnessing a couple blindside accidents, one of them a rollover, I started to rethink that credo. In addition to the safety a fixed roof and curtain airbags adds, I just don't want a convertible in Arizona anymore.