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

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

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.

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Spectre Performance 9771 Black 4" Intake Coupler

Product ID: 101163562

Details

Brand
Spectre
Colour
Black
Connector Type
Reducer
Exterior Finish
Black
Item Weight
0.2 Kilograms
Item dimensions L x W x H
10.2 x 10.2 x

🔄3.75-inch removable reducer

🔩4-inch OD universal fit

🛠️2 stainless steel worm gear clamps

₩87517

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Description

🔧 Upgrade your airflow game with Spectre’s precision fit!

BUILT TO LAST - Durable stainless steel clamps ensure a secure, rust-resistant hold under pressure.
TRUSTED QUALITY - Rated 4.7/5 by nearly 1,000 users—join the community of satisfied performance enthusiasts.
CUSTOMIZABLE FLOW - Includes a removable 3.75-inch reducer for tailored airflow control.
SLEEK BLACK FINISH - Matte black exterior adds a professional, stealthy look to your engine bay.
SEAMLESS 4 CONNECTION - Effortlessly link any 4-inch OD intake tubes for a perfect fit every time.

The Spectre Performance 9771 Black 4" Intake Coupler is a high-quality, durable connector designed to join any 4-inch outside diameter air intake tubes. Featuring two stainless steel worm gear clamps and a removable 3.75-inch reducer, it offers customizable airflow and a secure fit. Ideal for naturally aspirated engines, this sleek black coupler is trusted by nearly 1,000 users for reliable performance and longevity.

Specifications

ASIN	B001OMK53K
Brand Name	Spectre
Colour	Black
Connector Type	Reducer
Country of Publication	USA
Customer Reviews	4.7 4.7 out of 5 stars (973)
Exterior Finish	Black
Global Trade Identification Number	00089601977102
Item Dimensions	10.2 x 10.2 x 10.2 Centimeters
Item Type Name	coupling
Item Weight	0.2 Kilograms
Manufacturer	Spectre
Manufacturer Part Number	9771
Material Type	Stainless Steel
Model Number	SPE-9771
Number of Packs	1
Number of Pieces	1
Size	Small
Thread Size	4 inch
Thread Type	NPT
UPC	089601977102
Unit Count	1.0 Count

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₩87517

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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1 week ago

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