Spectre Coupler 4in. ID - Black

The Spectre Coupler 4in. ID in Black (part number 97711) is a straight-style PVC coupler that joins two 4-inch OD intake tubes or ducting components in naturally aspirated setups. The 97711 provides an air-tight, vibration-damping connection for cold-air intake extensions, air box connections, and replacement of damaged factory couplers at the 4-inch diameter. Stainless steel worm-gear hose clamps are included for a secure, rattle-free installation. Not suitable for pressurized turbocharger or supercharger intake applications.

Features and Benefits

• 4-inch inside diameter mates with standard 4in OD intake tubing and ducting
• PVC material provides flexibility for easy installation and absorbs engine vibration
• Straight coupler design for same-diameter tube-to-tube connections
• Black finish suits most engine bay color schemes
• Includes stainless steel worm-gear hose clamps for leak-free retention
• Suitable for naturally aspirated cold-air intake, filter connects, and air ducting repairs
• Consistent wall thickness from Spectre Performance manufacturing
• Economical solution for intake system repairs and custom builds at the 4-inch size

Specifications

What's Included

• 1 x Spectre 97711 PVC straight coupler (4in ID, black)
• Stainless steel worm-gear hose clamps

Frequently Asked Questions

What tube size does the Spectre 97711 fit?
The 97711 has a 4-inch inside diameter and mates with 4-inch OD intake tubing used in most large-diameter cold-air intake kits and air duct assemblies.

Can the 97711 be used on a turbocharged vehicle?
No. This is a PVC coupler rated for naturally aspirated applications only. Pressurized intake systems require a silicone coupler rated for boost pressure. Use the 97711 on the cold-air intake pre-turbo section or on naturally aspirated engines only.

What is the difference between the 97711 and the 9771?
Both are 4-inch straight black PVC couplers from Spectre. They may differ in length or wall construction. Confirm dimensions when ordering if you have strict overall length requirements for your intake layout.

Does the 97711 include hose clamps?
Yes, stainless steel worm-gear clamps are included for secure installation at both ends of the coupler.

Is the Spectre 97711 compatible with silicone intake hoses?
The 97711 connects tube-to-tube (rigid tubing). If one end is a silicone hose, the silicone hose outer diameter must match the coupler 4-inch inside diameter. Confirm compatibility before installation.

Can I trim the 97711 coupler to a shorter length?
PVC can be trimmed with a sharp utility knife or fine-tooth saw. Ensure the cut is square and that sufficient coupler length remains to provide a secure clamp zone on each tube end (minimum 1 inch engagement per side).

Will this coupler hold up under heat cycling in the engine bay?
PVC couplers perform well in engine bay ambient temperatures typical of naturally aspirated applications. They are not suited for high-heat applications such as intercooler piping on turbocharged vehicles where silicone is the appropriate choice.

How do I ensure a leak-free installation with the 97711?
Insert both tube ends fully into the coupler, position clamps 0.5 inches from the tube ends, and tighten to approximately 30-35 in-lb. Check for air leaks at idle by listening for hissing sounds around the couplers with the engine running.

Installation Instructions

1. Verify that both intake tube ends measure 4 inches OD before installation.
2. Slide a hose clamp onto each tube end before inserting the coupler.
3. Insert one tube fully into one end of the Spectre 97711 coupler.
4. Insert the second tube fully into the other end of the coupler.
5. Position each hose clamp over the coupler-to-tube overlap zone, approximately 0.5in from the tube end.
6. Tighten each clamp evenly to secure the joint without over-compressing the PVC.
7. Inspect the installation before running the engine to confirm alignment and full tube insertion on both sides.

Proposition 65 Warning: This product can expose you to chemicals including Diisononyl Phthalate (DINP), which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.