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Add an Accessory:
Spectre Performance 9771 Black 4" Intake Coupler
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Spectre Performance SPE-9775 4" Flex Boot, Black

4.5 4.5 out of 5 stars 67 ratings
$42.99
FREE Returns
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Purchase options and add-ons

  • EPDM/TPE rubber
  • Durable design
  • Available in black
  • Not recommended for turbo-charged and super-charged engines
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Frequently bought together

Spectre Performance SPE-9775 4" Flex Boot, Black
$42.99
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Spectre Performance 9781 Black 4" 90 Degree Boot
$29.99
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Ships from and sold by Amazon.com.
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Spectre Performance 9771 Black 4" Intake Coupler
$21.49
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In Stock
Ships from and sold by Amazon.com.
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Top Brand: Spectre

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From the manufacturer

About Spectre Performance

Since 1983 Spectre has designed and offered unique and innovative parts and components to fuel your car or truck obsession. Our products are designed and tested to perform and last. We have a state of the art chassis dynamometer with diagnostic and emissions testing and performance optimizing capabilities, as well as a top of the line Super-Flow flow bench with airflow, pressure, and velocity measuring capabilities in both intake and exhaust modes, and also a whole bunch of expensive scientific laboratory type equipment, all of which are used to develop Quality Products that Perform.

Air Filter Types

Air Filters by Vehicle

Clamp-on Universal Air Filters

Breather Air Filters

Round Air Filters

Spectre Performance Air Filters provide exceptional airflow for increased performance. You can reduce the airflow restriction without sacrificing engine protection with a Spectre HPR air filter.

Oval Air Filters

Triangular Air Filters

Inline Cone Air Filters

Engine Accessories

Spectre's Engine Accessories are manufactured using the highest quality materials and are designed to perform as good as they look. Accessories include multiple brackets and latches, as well as GM, Ford and Chrysler chrome engine kits, master cylinder covers, power steering dipsticks, engine oil pans and dipsticks, pulleys, throttle body spacers, timing chain covers and GM, Ford and Chrysler valve covers. Engineered for optimum fit and function Spectre's accessories are the perfect compliment to your hard work.

Air Intake Components

Spectre offers air intake components for DIY car enthusiasts so they can design and build a cold air intake for their modified car or truck. If you need to design and build a custom one-off air intake system, Spectre has you covered. Check out our air ducting components, air intake tubes, brackets, mounting plates, air intake hoses, coupler and hose clamps, couplers, reducers, silicone funnels and mass air flow sensor accessories. It's easy to build your own air intake with Spectre air intake components.

Spectre Air Intake Installation

Spectre application specific air intake systems are designed to be a direct fit bolt-on replacement to the stock intake system so installation can be quick and easy. Spectre cold air intake systems come with detailed installation instructions and are easy to install with common hand tools.

Product Description

Spectre’s EPDM/TPE couplers, elbows and reducers are available to help you connect different air intake tubes together with ease. We offer multiple length and shape couplers and reducers with 3, 3.5 and 4 inch inside diameter sizes. These couplers are also offered with additional angles to match the direction you want your intake to route. Our EPDM and TPE couplers and reducers are not recommended for turbo-charged and super-charged engines.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Spectre Performance SPE-9775 4" Flex Boot, Black

Spectre Performance SPE-9775 4" Flex Boot, Black

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What's in the box

  • 4"ID FLEX BOOT

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    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    67 global ratings
    Great 4” Flex-able coupler
    5 Stars
    Great 4” Flex-able coupler
    Used to make a flexible custom intake. Worked exactly as I needed. It’s hard to find these kinds of couplers especially in 4” ID. Plenty of flex for most applications. Would not recommend on forced induction.
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    Top reviews from the United States

    joey
    5.0 out of 5 stars Great 4” Flex-able coupler
    Reviewed in the United States on September 29, 2020
    Verified Purchase
    Used to make a flexible custom intake. Worked exactly as I needed. It’s hard to find these kinds of couplers especially in 4” ID. Plenty of flex for most applications. Would not recommend on forced induction.
    Customer image
    joey
    5.0 out of 5 stars Great 4” Flex-able coupler
    Reviewed in the United States on September 29, 2020
    Used to make a flexible custom intake. Worked exactly as I needed. It’s hard to find these kinds of couplers especially in 4” ID. Plenty of flex for most applications. Would not recommend on forced induction.
    Images in this review
    Customer image
    Customer image
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    Mark A. Jones
    5.0 out of 5 stars It fit the plenum and duct perfectly
    Reviewed in the United States on August 31, 2021
    Verified Purchase
    It fit and allowed movement. Cant say much else! It worked
    Helpful
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    MH
    5.0 out of 5 stars Fits as agreed
    Reviewed in the United States on August 22, 2019
    Verified Purchase
    Good quality
    Helpful
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    Amazon Customer
    5.0 out of 5 stars Five Stars
    Reviewed in the United States on March 3, 2018
    Verified Purchase
    Nice product would purchase again
    Helpful
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    Rick Hegney
    5.0 out of 5 stars Five Stars
    Reviewed in the United States on August 4, 2017
    Verified Purchase
    Great
    Helpful
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    Kay Jay
    5.0 out of 5 stars Just as described.
    Reviewed in the United States on April 30, 2017
    Verified Purchase
    Worked well.
    One person found this helpful
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    Jcyeah23
    1.0 out of 5 stars NEGATIVE STARS PLEASE
    Reviewed in the United States on October 6, 2017
    Verified Purchase
    Severely disappointed in the product. Doesn't flex in the least. Didnt even come close to serving it's purpose. Terrible product...
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    Top reviews from other countries

    Amazon Customer
    5.0 out of 5 stars Good rubber
    Reviewed in Canada on October 16, 2019
    Verified Purchase
    Fits like it should
    Report