Speculation has been swirling over the last two years that a Mazdaspeed version of the MX-5 was right around the corner. At first, it was rumored to be released in late 2007, then early 2008, then early 2009 and then... nothing.
Speaking with Autoblog, Mazda's PR man Jeremy Barnes made it clear that the automaker has no plans to offer a Mazdaspeed version of the current MX-5. While it was originally assumed that the turbocharged 2.3-liter four-pot found in the Mazdaspeed3 would eventually find its way under the hood of the MX-5, Mazda discovered that the swap wasn't a bolt-in affair. According to Barnes, "It does theoretically fit, until you bolt on the head." A high-pressure fuel pump on the back of the head, driven off the cam, would necessitate a notch in the firewall. As such, converting the engine from a transverse (FWD) to a longitudinal (RWD) layout just wasn't feasible.
Thankfully, in addition to Mazdaspeed's own lineup of suspension and engine components, aftermarket companies are developing their own forced induction systems for the NC MX-5. Cosworth is currently testing a supercharger and Flyin' Miata is a couple months away from releasing its own centrifugal blower.