If your Miata has begun to misfire, idle erratically, or hesitate under acceleration a bad coil pack could be to blame. By providing the proper spark to the spark plug all of these running issues can be resolved. This AA Ignition Coil Pack is a direct replacement for the factory coil. Made by an original equipment supplier (OEM) these coil packs surpass the factory quality and will get your Miata running how it should be; smooth and fast. This Ignition Coil Pack fits the following models:1998, 1999, 2000 MiataReplaces the following part numbers: BP4W1810XB9U, BP4W1810XA, BP4W1810XB, BP4W1810X, BP4W-18-10XA, BP4W-18-10XB, BP4W-18-10X, 178-8492, 88921398, C1186Manufactured by AA Ignition, exceeds the factory specification, and carries a 24 month or 24,000 mile warranty. This is not a genuine OEM part, the terms, makes, models and part numbers are used only to identify which vehicles this part fits.