Universal 3.5" x 4" Silicone Coupler (FR-UNI-SIL-3.5/4)

The Full-Race 3.5" to 4" Silicone Transition Coupler is a highly durable and essential component for creating a smooth, straight-line transition from 3.5-inch to 4.0-inch diameter piping in high-performance intake and charge pipe systems. Constructed from high-quality 4-ply silicone with a robust 0.110-inch wall thickness, this coupler is engineered for maximum strength. It is built to reliably handle high boost pressures, high heat, and engine movement without blowing off or tearing, making it perfect for connecting large-diameter turbo inlets to air filter systems.

Features

• Designed for a smooth, straight-line diameter transition from 3.5 inches to 4.0 inches.
• Constructed from heavy-duty 4-ply silicone for maximum strength and resilience.
• Features a thick wall of 0.110 inches for reliability under extreme boost and heat.
• Ideal for connecting components with a substantial difference in size, such as large intakes to turbo inlets.

Notes

• Requires appropriate clamps (T-Bolt clamps recommended, sold separately) for secure installation on both ends.
• Suitable for custom intake and charge pipe fabrication involving a transition between 3.5-inch and 4.0-inch piping.

Specs

• Size: 3.5 inches to 4.0 inches (Transition)
• Material: 4-Ply Silicone
• Wall Thickness: 0.110 inches