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2004 Volvo S40

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Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

Overview Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Universal-Fit Audio for 2004 Volvo S40

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

Better sound with your factory radio

Better sound with a factory radio

Love your factory look or can't replace the stereo? We got you covered.

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Metra AD-EX24

2 ft. Universal Antenna Extension Cable with Capacitor

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Metra AD-EX24

2 ft. Universal Antenna Extension Cable with Capacitor

• 24" (2 foot) universal antenna extension cable
• Built-in impedance matching capacitors to prevent signal loss
• Standard Motorola male-to-female connectors
• Ideal for long-run antenna installations in large vehicles or custom setups
• Plug and play connection, no cutting of wires required

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List price $4.99
-20% $3.99

Available

Ships in 10-14 days

Add to Cart

• 24" (2 foot) universal antenna extension cable
• Built-in impedance matching capacitors to prevent signal loss
• Standard Motorola male-to-female connectors
• Ideal for long-run antenna installations in large vehicles or custom setups
• Plug and play connection, no cutting of wires required

Crux HSD-EXT1L

1.5 ft. HSD Antenna Extension Cable (Cable Angled to the Left)

HSD-EXT1L big
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Crux HSD-EXT1L

1.5 ft. HSD Antenna Extension Cable (Cable Angled to the Left)

• HSD Antenna Extension Cable
• Cable designed and angled to the left
• Covered with plastic housing for added protection
• Cable Length: 1.5 feet (0.45 meter)

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Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $147.00
-36% $94.50

In stock.

Add to Cart

• HSD Antenna Extension Cable
• Cable designed and angled to the left
• Covered with plastic housing for added protection
• Cable Length: 1.5 feet (0.45 meter)

Crux HSD-EXT3

3 ft. HSD Antenna Extension Cable

HSD-EXT3 big
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Crux HSD-EXT3

3 ft. HSD Antenna Extension Cable

• HSD Antenna Extension Cable
• Covered with plastic housing for added protection
• Cable Length: 3 feet (0.91 meter)

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Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $134.40
-36% $86.40

In stock.

Add to Cart

• HSD Antenna Extension Cable
• Covered with plastic housing for added protection
• Cable Length: 3 feet (0.91 meter)

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    FAQ for Universal-Fit Audio & Electronics in 2004 S40

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2004 Volvo S40?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your S40.

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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