MAXIMUM PERFORMANCE Our cold air intake for the 2010-2021 Toyota 4Runner / FJ Cruiser was engineered to minimize air restriction and flows 43.47% better than stock. This kit comes with a fully enclosed airbox that protects the filter from dirt and keeps out engine heat. PROTECT YOUR ENGINE This kit comes with a massive, highly-efficient air filter which results in better performance and protects your engine. Available in either 8-layer Cotton Cleanable or Dry Extendable media.