Engine & Performance Warehouse FWBOX18X18X4 Firewall Pass-Through Box 18x18x4

The Engine & Performance Warehouse FWBOX18X18X4 is an 18" x 18" x 4" firewall box designed for custom engine bay builds and fabrication projects. This pass-through enclosure provides a clean, professional solution for routing wiring harnesses, fuel lines, brake lines, and other components through the firewall while maintaining a sealed, finished appearance.

Key Features:

• Dimensions: 18" x 18" x 4" — generous sizing to accommodate multiple lines and harnesses
• Designed for firewall mounting in custom and performance vehicle builds
• Provides a clean routing point for wiring, plumbing, and hydraulic lines through the firewall
• Suitable for street rods, race cars, restorations, and custom builds
• Constructed for durability in underhood environments

Ideal for builders seeking a tidy, professional finish when routing critical components through the firewall, the FWBOX18X18X4 eliminates the need for improvised solutions and delivers a factory-quality appearance in custom applications.