HKS SPF RX-7 FC3S/FC3C 13BT - HKS70017-AZ102

HKS SPF RX-7 FC3S/FC3C 13BT is a high-performance, drop-in replacement air filter specifically designed for the Mazda RX-7. It is a "dry-type" filter that replaces the factory paper element to improve engine airflow and efficiency without requiring modifications to the stock airbox.

• Density Gradient Structure: Unlike standard filters that trap debris on the surface, this filter uses a non-woven fabric with layers that get progressively denser. This allows it to capture various sizes of dust in stages, preventing premature clogging and maintaining high airflow over a longer period.
• Improved Efficiency: HKS claims a dust collection performance of over 95% while simultaneously reducing intake resistance.
• Durability: The filter includes a reinforced case frame for added strength.
• Cost-Effective Maintenance: The plastic frame is reusable. When the filter becomes dirty (recommended every 12 months or 10,000 km), you can purchase a replacement "M2 size" filter sheet (part number HKS70017-AK104) and swap it into the existing frame.