Fits ALL NA and NB Miatas, including the 1999-00 and MSM.
These cam gears are designed for maximum durability as well as ease of adjustment. The outside ring is coal blasted and hard anodized for grip and durability. 24 degrees of adjustment. What makes them different is that they come with the triggers needed for the intake cam on 1999-00 and Mazdaspeed engines. This means you can now adjust both the intake and exhaust cam timing on these engines.
So what benefit can you see from adjustable gears? It depends on what else has been done to your car. You can move the peak power around for either more ultimate power or greater midrange torque. This dyno chart shows an example of the sort of changes that are possible by adjusting the gears.
Sold individually. Not compatible with VVT intake cams, they're already adjustable!