Price
The stock clutch on the NC is fine for naturally aspirated power, but it won't hold up long-term if you increase the power.
Flyin' Miata clutches are known for being easy to drive, with a smooth engagement and a good pedal weight - all at an excellent price. The friction material is a steelback copper woven organic material.
Rated (conservatively) for 260 lb-ft at the crank, they're an excellent match for forced induction systems. Includes pilot and throwout bearings along with an alignment tool.
For the 5-speed transmission.