Granatelli Motor Sports HD 4.00 Inch Clamshell 318540CS

Granatelli Motor Sports Dual Seal HD 4.0 Inch Tubing Coupler Clamp

SKU: 318540CS

Heavy-Duty Quick-Release Clamshell Clamp for Extreme Turbo and High-Boost Applications

The Granatelli Motor Sports Dual Seal HD 4.0 Inch Tubing Coupler Clamp is built for extreme-performance applications where maximum airflow, boost retention, and reliability are non-negotiable. Precision-machined from T-6061 aluminum, this clamp is engineered to handle the demands of high-horsepower turbocharged and forced-induction systems while maintaining a clean, professional appearance.

Featuring Granatelli’s patented pin-and-ball quick-release clamping mechanism, this clamshell-style clamp provides a secure mechanical lock that resists vibration, heat cycling, and extreme boost pressure. Designed for 4.0-inch (102mm) tubing couplers, it delivers consistent, leak-free sealing in large-diameter intake and charge pipe systems.

Product Specifications

• Tubing Coupler Type: Straight
• Material: T-6061 Aluminum
• Finish: Black
• Inlet Diameter: 4.00 in. (102.00 mm)
• Outlet Diameter: 4.00 in. (102.00 mm)
• Quantity: Sold individually

Performance Features

• Dual-seal HD design for maximum boost retention and leak prevention
• Pin-and-ball quick-release system for fast installation and servicing
• Vibration-resistant under extreme boost and engine movement
• Maintains sealing integrity under high pressure and elevated temperatures
• Ideal for repeated disassembly without clamp fatigue or loss of clamping force

Included Components

• One heavy-duty outer clamp assembly
• One ball/pin safety retention pin

Designed for professional fabricators, racers, and serious performance enthusiasts, the Granatelli Motor Sports Dual Seal HD 4.0 Inch Clamshell Clamp is the ideal solution for large-frame turbo systems, high-boost charge piping, intercooler connections, and extreme horsepower builds. When airflow, strength, and serviceability matter most, Granatelli Motor Sports delivers proven performance.

Key Features & Benefits

• Application-focused Granatelli Motor Sports design
• Built for dependable performance and service
• Designed for enthusiasts, professional installers, and performance builds

Fitment & Installation

Confirm the part number, vehicle or engine application, dimensions, and supporting components before installation. Modified vehicles may require additional clearance, fabrication, calibration, or related hardware depending on the combination.

Frequently Asked Questions

How do I confirm fitment?
Match the part number and listed application to your vehicle, engine, dimensions, and supporting components before ordering.

Will this work on a modified vehicle?
Compatibility depends on the complete vehicle combination. Confirm the listed application and supporting components before installation.

Why Choose Granatelli Motor Sports?

Granatelli Motor Sports develops performance components for real-world street, street/strip, race, and custom applications, with an emphasis on practical performance, dependable construction, and integration into serious automotive builds.