GSL Toyota Landcruiser 300 Series Performance Airbox PLEASE NOTE: THIS AIRBOX REQUIRES TUNING WITH FITMENT AND SUPPORTING MODIFICATIONS. The Toyota 300 Series LandCruiser is built tough—but one of the known weak points across the Cruiser range is the factory airbox. With minimal clamping force and soft rubber seals that can pinch or leak, the standard setup leaves your engine exposed to dust ingestion—something no one wants when tackling dusty Australian conditions. That’s where the GSL 300 Series Performance Airbox comes in. Designed and tested in-house, the GSL airbox is constructed from high-quality 304-grade stainless steel, delivering superior strength and long-term durability in demanding environments. It features precision-cut perspex inspection lids with a clean 3D engraved GSL logo, allowing you to quickly and easily check filter condition. Supplied with custom mounting brackets and all required hardware, installation is straightforward and hassle-free. A proper seal is critical to airbox performance—so we’ve gone all in. Across the GSL range, our airboxes are the only ones on the market engineered to guarantee three sealing contact points on the filter. Our design features a three-surface sealing system that delivers consistent compression and a secure filter fit. This eliminates the risk of seal pinching while significantly improving clamping force and dust protection. .