The K&N 33-2676 is a red panel replacement filter for the 1999–2005 Mazda Miata NB, built on layered, oiled cotton media engineered to improve airflow and capture contaminants. Its drop-in design fits the factory airbox, so you keep the stock housing and clips. Choose it over a disposable paper element when you want a filter you can clean and reuse. The manufacturer says each filter is reusable and backed by the No-Hassle Lifetime Limited Warranty. Expect no horsepower gain on a stock NB. Owners on user forums say no independent dyno test has shown a gain beyond measurement error. Treat it as a reusable, lower-lifetime-cost filter, not a power upgrade.
Long-tail searches for this part include "99-05 Miata NB drop in air filter," "K&N 33-2676 NB Miata airbox," and "washable reusable Miata panel filter." The manufacturer states its drop-in replacement filters are designed to install easily into the factory air box. User forums report MAF sensor problems that owners link to K&N re-oiling, so apply only the recommended oil and keep it off the sensor. Owners also note that with the K&N in place they cleaned the throttle body, throttle plate, and MAF sensor about every three months.
The manufacturer's dimensions and drop-in design are listed for the 1999–2005 Miata. Some third-party application lists include other models, and the manufacturer's own page header names a different Mazda model, so confirm fitment against the manufacturer's application guide before ordering.
The manufacturer says the filter is designed to increase horsepower. Owners on user forums report no measurable power gain on a stock NA or NB, so details vary. Choose it for reusability, not for power.
Yes. The manufacturer lists the filter as washable. The manufacturer's install sheet covers the cleaning and re-oiling steps.
This is a no-tools-required swap for most owners: open the airbox, remove the disposable panel, and drop the K&N into the same position. The manufacturer publishes an installation instruction sheet covering the process. Keep the airbox sealed after installing, because owners on user forums report that dust leaking past the filter is a concern. Use only the oil and cleaning method listed on the instruction sheet to avoid MAF sensor issues.
