This is by far the best thing I ever did with my ND2 Miata, I have no other mods besides this and a tune to enable it. I started out as a basic 4cyl slow but fun little car, to an actual feeling of zoom zoom. This little mod can get you to take on other 4cyl with turbo and an even higher hp than this nd2, and even some v6s. It was a perfectly easy install, although taking it apart shouldnt take you more than 4 hours, frustration hours included. Putting everything back together was a quick 30 min for me. You will not regret this purchase at all, especially with E85 being of convenience at any location in CA, you will definitely smile every day with this

This is the single best mod for my ND2 Miata. I've installed cold air intake, mid-pipe, FM hush-0-matic muffler, and headers. They made minor subjective noticeable power gain. I've experienced 30% more power with these injectors. I was smiling and laughing the first time I drove with this mod. My car changed its driving character for the better as it went from quick to fast. I didn’t have my headers on, but the exhaust note is considerably loud probably because the car is burning more fuel.
Installation tip: Remove battery, intake, driver side wheel, coolant reservoir so you have room to work removing the intake manifold. Have patience as you will probably spew out swear words. Hardest part is removing the harnesses behind/under the manifold and one bolt located right above the starter.
The injectors are truly spectacular. I only plan to on using 91 octane and not run it on E85. Don’t forget to get the Versatuner tune file for these. Great customer service from Fab9 as you can actually talk to a human being for help.