Yes, it comes with a reducer rubber ring that can be removed to fit 3.75" tubing.

Spectre Performance 9771 Black 4" Intake Coupler

Q: The ones i wanted are used on spe-733 and spe-9751 the unit i bought. not available without buying the whole system again?

A couple of years ago, I purchased this individually and worked great for my LS intake tubing. Good Luck

Q: Why is this not recommended for Turbo/Supercharged engines?

I cannot answer about the turbo/supercharged engines. My application was for an LS normal aspirated intake tubing and it worked great.

Product ID: 4373143

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Details

Size
Klein
Material
EPDM/TPE
Brand
Spectre
Color
Black
Item dimensions L x W x H
4 x 4 x 4
Connector Type
Reducer

📏4-inch universal fit

🔩2 stainless steel clamps included

⚙️3.75-inch removable reducer

Frequently Bought Together

Description

⚡ Elevate your intake game with precision and durability!

BUILT TO LAST - Durable EPDM/TPE rubber construction ensures long-lasting performance under pressure.
SECURE CLAMPING - Includes two premium stainless steel worm gear clamps for rock-solid sealing.
CUSTOMIZABLE FLOW - Removable 3.75-inch reducer lets you tailor airflow to your setup’s needs.
SEAMLESS 4 CONNECTION - Effortlessly link any 4-inch OD intake tubes for a perfect fit every time.
ENGINEERED FOR NATURALLY ASPIRATED - Optimized for non-turbocharged engines to maximize reliability and efficiency.

The Spectre Performance 9771 Black 4" Intake Coupler is a robust EPDM/TPE rubber connector designed to join any 4-inch outside diameter air intake tubes. It includes two stainless steel worm gear clamps for secure installation and a removable 3.75-inch reducer for customizable airflow. Ideal for naturally aspirated engines, this durable coupler offers a sleek black finish and reliable performance without turbo or supercharger compatibility.

Specifications

Size	Klein
Material	EPDM/TPE rubber
Brand	Spectre
Color	Black
Item dimensions L x W x H	4 x 4 x 4 inches
Connector Type	Reducer
Thread Size	4 inch
Exterior Finish	Black
Thread Type	NPT
Item Weight	0.2 Kilograms
Number of Pieces	1
Global Trade Identification Number	00089601977102
Manufacturer	Spectre
UPC	089601977102
Model	9771
Item Weight	7.2 ounces
Product Dimensions	4 x 4 x 4 inches
Item model number	SPE-9771
Is Discontinued By Manufacturer	No
Manufacturer Part Number	9771
OEM Part Number	9771

Have a Question? See What Others Asked

will it fit 3.75" ??

The ones i wanted are used on spe-733 and spe-9751 the unit i bought. not available without buying the whole system again?

What is the id? i'm using this on a dust collection system with fitting that are 4" od

Why is this not recommended for Turbo/Supercharged engines?

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