K&N High-Flow Engine Air Filter 33-5040 — Washable Reusable Lifetime Filter for 2015–2024 124 Spider/MX‑5, Increased Airflow

K&N High-Flow Original Lifetime Engine Air Filter (33-5040) is a washable, reusable replacement filter engineered to increase airflow and support improved engine response for compatible 2015–2024 Abarth, Fiat and Mazda roadsters.

This performance replacement filter is built from multilayer cotton gauze media and designed to drop into your factory air box with minimal tools. Unlike single-use paper elements, this K&N unit is serviceable, intended to be cleaned and re-oiled periodically, and backed by a long-term limited warranty. It’s sized and shaped to fit specific 124 Spider and MX-5/Miata models listed for model years 2015 through 2024 so installation is quick and reversible.

How does this filter affect throttle response and horsepower?

The high-flow cotton media permits more air to reach the engine compared with many stock paper filters, which can help the engine breathe better during acceleration. Gains depend on vehicle setup and conditions, but many drivers report improved throttle feel and smoother mid-range acceleration after installation.

• Multilayer cotton gauze increases airflow while still trapping contaminants.
• Engineered to maintain filtration efficiency under higher flow rates.
• Helps the engine draw air with less restriction for improved response.

How often do I need to service the filter and what does upkeep involve?

K&N filters are reusable and require cleaning less frequently than disposable paper filters. Under normal highway driving, you typically clean the element about every 75,000 miles; heavier dust or off-road use calls for earlier attention. Cleaning requires a K&N cleaning kit and re-oiling the media before reinstalling.

• Clean roughly every 75,000 miles in normal driving conditions.
• Use the recommended K&N cleaner and oil for best results.
• Drying and re-oiling steps restore filtration and performance.

Will this filter fit my 124 Spider or MX-5/Miata?

This specific K&N part (33-5040) is calibrated to match the airbox dimensions of certain Fiat/Abarth 124 Spider and Mazda MX-5/Miata generations. Check the listed compatible years and models before purchase to ensure correct fitment. The filter is designed as a direct-fit replacement so no modification of the intake system is typically required.

• Compatible with 2016–2018 Abarth 124 Spider and 2016–2020 Fiat 124 Spider.
• Fits multiple Mazda MX-5/Miata and Roadster model years up to 2024.
• Designed for direct installation into the factory air box.

Is this filter durable and environmentally friendly?

K&N builds these filters from robust materials intended for long-term use, reducing the number of disposable filters sent to landfill. The durable construction and lifetime warranty mean the same filter can serve for many years with proper maintenance. Manufacturing in the USA also ensures consistent quality controls.

• Reusable design reduces disposable filter waste over the vehicle’s life.
• Constructed from layered, treated cotton gauze for longevity.
• Backed by a limited lifetime warranty for peace of mind.

Who is this for: Enthusiasts and daily drivers of compatible Fiat/Abarth 124 Spiders and Mazda MX-5/Miata models who want an easy, long-lasting upgrade to their stock intake filtration. It’s ideal for owners seeking improved engine breathing, reusable maintenance, and a straightforward direct-fit swap without intake modification.