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Spectre 9751 Air Duct Hose Kit - 4in. OD / 41in. Flexible Ducting with 2 Threaded PVC Couplers - Black
The Spectre 9751 air duct hose kit provides a complete flexible ducting solution for custom cold air intake and engine air routing projects. The kit includes 41 inches of 4-inch OD flexible black ducting along with two threaded PVC couplers that allow the duct to connect securely to air filter necks, airbox openings, and intake tube ends. The memory flex material holds its shape when formed around engine components while remaining flexible enough for easy routing. This kit is ideal for ducting outside air to a high-flow filter or routing air from a cold air source to an existing airbox.
Features and Benefits
- 41 inches of flexible 4-inch OD air ducting for versatile routing
- Two threaded PVC couplers included for quick, tool-free connections
- Memory flex construction holds routing shape after forming
- Black color for a clean appearance in the engine bay
- Compatible with 4-inch air filters, intake tubes, and airbox openings
- No cutting required - duct can be trimmed to desired length
- Replaces or supplements factory cold air ducting
Specifications
| Specification | Detail |
|---|---|
| Part Number | 9751 |
| Brand | Spectre Performance |
| Duct OD | 4 in. |
| Ducting Length | 41 in. |
| Couplers Included | 2 x Threaded PVC Couplers |
| Color | Black |
| Fitment | Universal |
| Warranty | Limited lifetime |
What's Included
- 1 x 41in. Flexible Black Air Duct (4in. OD)
- 2 x Threaded PVC Couplers
Frequently Asked Questions
What is the duct diameter on the Spectre 9751?
The 9751 uses 4-inch OD flexible ducting, compatible with 4-inch intake tubes, air filters, and airbox connections.
Can the ducting be trimmed to a shorter length?
Yes. The flexible duct can be cut with scissors or a knife to the required length for your specific installation.
What are the PVC couplers used for?
The included threaded PVC couplers attach to each end of the duct and thread onto compatible air filter necks or tube ends to create a sealed connection.
Can the 9751 duct be used to route fresh air to a cold air intake?
Yes. This is one of the primary applications for the 9751. Route the duct from the filter inlet to a cold air source such as a fender opening or lower grille.
Does the memory flex material hold its shape?
Yes. After you form the duct around engine components, the memory flex material maintains that shape without requiring additional supports.
Is the 9751 compatible with all 4-inch intake systems?
Yes. It works with any 4-inch air filter neck, tube end, or airbox opening that accepts a standard PVC coupler.
Is the 9751 a universal fit?
Yes. It is a universal component suitable for any intake or ducting project using 4-inch components.
Can the 9751 ducting handle underhood heat?
The flexible duct is designed for intake air use. For best performance, route it away from direct exhaust or engine heat sources.
Installation Notes
- Thread the PVC couplers onto the intake filter neck and the destination connection point.
- Measure and trim the flexible duct to the required length.
- Insert each end of the duct into the threaded couplers and hand-tighten.
- Route the ducting around engine components, forming as needed to hold the desired path.
- Secure with tie straps or clamps if necessary to prevent movement.
- Start the engine and confirm there are no air leaks at the coupler connections.
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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