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Spectre 97991 Universal Aluminum Tube Elbow 4in. OD x 16in. / 90 Degree
The Spectre 97991 is a mandrel-bent aluminum tube elbow measuring 4 inches in outside diameter with a 16-inch leg length and a 90-degree bend angle. Designed for custom air intake fabrication, intercooler piping, and heat-exchanger routing, the 97991 is CNC-formed from high-quality aluminum for a smooth interior surface that promotes consistent airflow with minimal turbulence. The polished finish adds a clean, professional look to any engine bay build.
Features and Benefits
- Mandrel-bent aluminum construction maintains consistent 4-inch inside diameter through the entire bend
- 16-inch straight leg provides ample length for routing in tight engine bays
- 90-degree bend angle suits a wide range of intake and intercooler piping layouts
- Polished finish resists corrosion and enhances underhood appearance
- Smooth interior bore reduces turbulence and pressure drop compared to cast fittings
- Compatible with standard 4-inch silicone couplers and clamps
- Lightweight aluminum keeps total system weight low
Specifications
| Specification | Detail |
|---|---|
| Part Number | 97991 |
| Brand | Spectre Performance |
| Outside Diameter | 4 inches |
| Leg Length | 16 inches |
| Bend Angle | 90 Degrees |
| Material | Aluminum |
| Finish | Polished |
| Wall Thickness | Approximately 2mm |
| Application | Universal - Custom Air Intake / Intercooler Piping |
What's Included
- One (1) Spectre 97991 aluminum 90-degree tube elbow, 4in. OD x 16in. length
Frequently Asked Questions
What is the outside diameter of the Spectre 97991?
The Spectre 97991 has a 4-inch outside diameter. Use 4-inch ID silicone couplers for connecting to other components in your intake or intercooler system.
How long is the straight leg on the 97991?
The 97991 features a 16-inch straight leg after the 90-degree bend, giving you extra routing length for complex engine bay layouts.
Can I use the Spectre 97991 for intercooler piping?
Yes, the 97991 is suitable for intercooler charge piping in custom turbo builds. The smooth bore and mandrel construction make it an excellent choice for pressure piping applications.
What couplers are compatible with the Spectre 97991?
Any standard 4-inch ID silicone coupler is compatible with the 97991. Spectre also offers matching silicone couplers and clamps that pair with this tube.
Is the 97991 aluminum tube weldable?
Yes, the 97991 is made from weldable aluminum alloy, making it suitable for custom fabricators who need to TIG-weld additional fittings or bungs.
How does the Spectre 97991 compare to the 97990?
Both are 4-inch OD 90-degree elbows, but the 97991 has a 16-inch leg versus the 97990's 6-inch leg, providing significantly more routing length for complex installations.
Does the Spectre 97991 require any additional hardware?
The 97991 tube elbow is sold individually. You will need silicone couplers, hose clamps, and any brackets or supports appropriate for your specific application.
What finish does the Spectre 97991 have?
The 97991 features a polished aluminum finish for a clean, professional appearance in the engine bay.
Installation Overview
- Plan your intake or piping routing before beginning disassembly of existing components.
- Measure and confirm the 97991's 4-inch OD and 16-inch leg fit your intended routing path.
- Clean the mating ends of all connecting tubes and the 97991 elbow.
- Slide a 4-inch ID silicone coupler over the end of the connecting tube.
- Insert the 97991 elbow into the coupler and position it in the desired orientation.
- Repeat on the other end with the mating component.
- Tighten all hose clamps evenly to the recommended torque to prevent air leaks.
- Start the engine and inspect all connections for leaks before returning to service.
California Residents: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information, visit P65Warnings.ca.gov.
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