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.

Spectre Performance 9771 Black 4 Intake Coupler

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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C$5956

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

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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	Spectre
Brand Name	Spectre
Colour	Black
Connector Type	Reducer
Country of Publication	USA
Customer Reviews	4.7 out of 5 stars 970 Reviews
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
Item dimensions L x W x H	10.2 x 10.2 x 10.2 Centimeters
Manufacturer	Spectre
Manufacturer Part Number	9771
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	SPE-9771
Number of Pieces	1
Size	Small
Thread Size	4 inch
Thread Type	NPT
UPC	089601977102
Unit Count	1.0 Count

Reviews

R**R

Works perfectly

Pretty good quality.

19.01.2025

F**D

ممتاز واصلي ويتحمل انصح به

ممتاز واصلي ويتحمل انصح به الفواصل الانتيك

8.03.2024

J**D

Did the trick!

Woked for my custom LS swap intake.

26.07.2021

G**O

Magnífico, quedó exacto

Llegó muy bien y es exactamente lo que esperé, logra conectar bien ambos tramos de 4" sin problema; gracias a este cople pude armar el resto de los elementos y el cofre cierra bien. Es de excelente calidad y luce de igual manera. Totalmente recomendable.

18.10.2022

S**P

Really nice coupler, worked perfect

Really nice coupler. Spectre makes great stuff. Utilized this in my custom shaker intake for my challenger along with the 4” 90 and 6” length of pipe. Great quality and great price. Used the bushing in this kit for the 4” 90 to adapt to throttle body.

23.04.2019

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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C$5956

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago