FQRANBO Firewall Pass Through for Holley Terminator X Max - Black Anodized Aluminum Bulkhead, 2-Hole Clamshell

FQRANBO's Firewall Pass Through replaces the stock grommet to route a Holley Terminator X Max wiring harness cleanly through the firewall using a two-piece, anodized aluminum bulkhead.

This pass-through is built to tidy engine-bay wiring by providing a durable, finished feed-through for the Holley Terminator X Max harness without relying on the factory rubber grommet. Machined from aluminum and anodized for corrosion and heat resistance, the unit offers two holes sized to fit common harness runs and a clamshell-style assembly that clamps wiring securely while protecting insulation from chafing.

How does this pass-through make firewall wiring neater?

The FQRANBO design converts a messy rubber grommet into a clean metal bulkhead that organizes the harness exit and gives a factory-like finish. Its two-piece shell clamps around the wiring, preventing the harness from sagging or shifting and creating a visible neat point where the engine harness meets the cabin bulkhead.

• Clamshell assembly secures wires flush to firewall.
• Arc-shaped wire opening reduces abrasion against insulation.
• Provides a finished, professional appearance in the engine bay.
• Fits Holley Terminator X Max harness routing without extra adapters.

What are the exact dimensions and hole sizes?

Understanding the sizing helps ensure this pass-through fits your firewall hole and harness. The outer plate measures 3.78" by 2.125" (3.78" x 2 1/8") and it contains two wire apertures sized to accommodate typical engine harnesses safely.

• Main opening: 1 1/8" diameter for larger harness bundles.
• Secondary opening: 3/4" diameter for smaller leads or sensor groups.
• Plate outer dimensions: 3.78" by 2 1/8" for accurate cutout planning.

How is the pass-through installed and secured?

Installation is straightforward: bolt the base plate to the firewall, route the harness, then clamp the top half over the wiring and fasten with the included middle and perimeter bolts. The two-piece arrangement makes it easy to retrofit the unit without disassembling the entire harness.

• Fix the base plate to the firewall first to establish position.
• Lay the harness into the arc-shaped channel to avoid pinching.
• Reassemble the top panel and tighten middle bolts to clamp harness.
• Secure with four outer bolts for stable, vibration-resistant mounting.

Why choose an anodized aluminum pass-through over a rubber grommet?

An aluminum bulkhead provides long-term durability and superior protection against heat, oil, and abrasion compared with soft rubber. The anodized finish improves corrosion resistance and presents a polished look while the precision-polished edges and arc-shaped opening protect wire insulation from wear over time.

• Aluminum construction resists heat and structural fatigue.
• Anodized surface repels corrosion and resists engine-bay chemicals.
• Precision-polished edges minimize wiring abrasion risk.
• Sturdy clamp design prevents harness movement under vibration.

Who is this for: This FQRANBO Firewall Pass Through is aimed at enthusiasts and professional installers fitting a Holley Terminator X Max into classic cars, hot rods, or performance builds who want a durable, tidy firewall feed without the factory grommet. It suits anyone seeking a finished engine-bay appearance, improved wire protection, and a repeatable installation method for performance wiring harnesses.