🔥 3.50" ID x 4.00" Long Straight Silicone Coupler – 5-Ply Reinforced, High-Temp Boot for Diesel Boost Applications

This 3.50" ID x 4.00" long straight silicone coupler is engineered for high-performance diesel and turbocharged applications. Constructed from 5-ply reinforced high-temperature silicone, it’s strength-tested to handle the extreme pressures, heat, and vibration found in high-boost intake and intercooler systems.

Ideal for connecting intercooler piping, intake manifolds, or turbocharger outlets, this coupler provides a durable, flexible, and leak-free solution trusted by performance builders and diesel enthusiasts alike.

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🔧 Key Features:

• Inside Diameter: 3.50"

• Length: 4.00"

• 5-ply reinforced high-temp silicone construction

• Strength-tested for high-boost diesel and racing applications

• Withstands elevated temperatures, oil, and vibration

• Smooth internal finish for optimal airflow and easy installation

• Ideal for turbocharger systems, intercoolers, charge-air plumbing, and custom piping setups

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📦 What’s Included:

• 1x 3.50" ID x 4.00" Straight Silicone Coupler Boot (Black)

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Whether you're building a compound turbo system or upgrading your charge-air connections, this straight silicone coupler offers the durability and reliability you need for boost-ready performance.