Garage
Shop

2003 Harley Davidson FXSTD/I Softail Deuce

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.

Universal-Fit Audio for 2003 Harley Davidson FXSTD/I Softail Deuce

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.

Loading...
Filters

We are sorry, no available results!

filter-icon Filters & Sort

NVX XSBI500

500-Amp Microprocessor-Controlled Dual Sensing Smart Battery Isolator and Relay (Handles up to 700-Amp Surge)

XSBI500 big
Go to item page Right Arrow Icon of Right Arrow

500-Amp Microprocessor-Controlled Dual Sensing Smart Battery Isolator and Relay (Handles up to 700-Amp Surge)

• 500-Amp continuous / 700-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16.5V DC operating range

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $9.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

8
List price $109.99
-18% $89.99

In stock

Used from: $76.88

• 500-Amp continuous / 700-Amp surge
• Ideal for car stereo systems and mobile electronics
• Prevents the main starter battery from draining
• 10V to 16.5V DC operating range

BBTCP big
Go to item page Right Arrow Icon of Right Arrow

Works with all subwoofer and speaker enclosures.

Universal Round Chrome-plated Terminal Cup for Speaker / Subwoofer Boxes
• Chrome-Plated Contacts
• Screw Binding Posts
• Easy to Install and Use

shipping truck icon Free shipping in USA. Provide zip for delivery date.
9
List price $7.99
-50% $3.99

In stock

Universal Round Chrome-plated Terminal Cup for Speaker / Subwoofer Boxes
• Chrome-Plated Contacts
• Screw Binding Posts
• Easy to Install and Use

NVX XW4BK20

20 ft 4-Gauge EnvyFlex True Spec Oxygen-Free Copper Power and Ground Wire (Black)

XW4BK20 big
Go to item page Right Arrow Icon of Right Arrow

20 ft 4-Gauge EnvyFlex True Spec Oxygen-Free Copper Power and Ground Wire (Black)

• 20 feet 4 gauge Power and Ground Wire
• Silver-tinned OFC (100% Oxygen-Free Copper) material
• Color: Black

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

9
$54.99

In stock

NVX SQW124

1200W Peak (600W RMS) 12" SQ-Series Dual 4-ohm Shallow-Mount Car Subwoofer

SQW124 big
Go to item page Right Arrow Icon of Right Arrow

1200W Peak (600W RMS) 12" SQ-Series Dual 4-ohm Shallow-Mount Car Subwoofer

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Rubber Surround
• Mount depth: 3.51"
• Sensitivity: 84 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $30.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $359.99
-17% $299.99

In stock

• Peak Power: 1200 watts
• RMS Power: 600 watts
• Impedance: Dual 4 ohm
• Polypropylene Cone
• Rubber Surround
• Mount depth: 3.51"
• Sensitivity: 84 dB

NVX XKIT46

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Complete 5/6-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 1500 Watts

XKIT46 big
Go to item page Right Arrow Icon of Right Arrow

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Complete 5/6-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 1500 Watts

• Complete 4 Gauge Amplifier Installation Kit
• For Amplifiers Up To 1500 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Dual Twisted Pair 5/6-Channel RCA Cable
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 100 amp fuse
• CEA-2015 and BC5W2 Compliant

4+ offers available
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $13.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

45
List price $179.99
-28% $129.99

In stock

Continue to cart

Available Offers (4) for NVX XKIT46
FREE NVX Amp Kit at Checkout!
Save 30% off an NVX XKIT46 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT46 Amp Kit! No code needed — discount applies automatically at checkout.
15% off an NVX XCAP10H w/ Select Amp Kits Add a qualifying amplifier to your cart and save 15% on the NVX XCAP10H Capacitor! No code needed — discount applies automatically at checkout.
15% off an NVX XCAP1F w/ Select Amp Kits Add a qualifying amplifier to your cart and save 15% on the NVX XCAP1F Capacitor! No code needed — discount applies automatically at checkout.

Tru Spec Dual 12in P (1460YX)

Empty Dual 12" Vented Prefabricated Enclosure for Sundown SA 12" Subwoofers

Dual 12in P big
Go to item page Right Arrow Icon of Right Arrow

Empty Dual 12" Vented Prefabricated Enclosure for Sundown SA 12" Subwoofers

• 12" Dual Ported Subwoofer Enclosure
• 3/4" Medium Density Fiberboard (MDF) construction
• Total box volume: 3.50 cubic feet
• Compatible for Sundown SA 12V2 subwoofers (Sold separately)

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

6
List price $299.99
-22% $234.99

In stock.

NVX SDTK20

91 mil 20 sq ft Car Trunk Sound Deadening Kit (Five 18" x 32" Sheets)

SDTK20 big
Go to item page Right Arrow Icon of Right Arrow

91 mil 20 sq ft Car Trunk Sound Deadening Kit (Five 18" x 32" Sheets)

• 20 square feet sound deadening kit
• Material Used: Vibration Dampener
• Material Thickness: 0.091 (2.3 mm)
• Install Location: Trunk
• Pack includes five 18" x 32" sheets

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

123
List price $71.99
-31% $49.99

In stock

Single 10" Sealed MDF Subwoofer Enclosure (Belva MDFS10)

10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (0.77 cu ft airspace 10SQTC)

MDFS10 big
Go to item page Right Arrow Icon of Right Arrow

10-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/ Polyfil (0.77 cu ft airspace 10SQTC)

• 0.77 cu ft Sealed Enclosure
• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

121
List price $99.99
-40% $59.99

In stock

Directed 506T

Glass Break Audio Sensor

506T big
Go to item page Right Arrow Icon of Right Arrow

Glass Break Audio Sensor

• Audio Sensor That Detects Attempts to Tamper with or Break Your Vehicle's Glass

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

19
List price $41.99
-33% $27.99

In stock

• Audio Sensor That Detects Attempts to Tamper with or Break Your Vehicle's Glass

Directed 504D

Stinger DoubleGuard Shock Sensor

504D big
Go to item page Right Arrow Icon of Right Arrow

Stinger DoubleGuard Shock Sensor

• Stinger DoubleGuard Shock Sensor
• Adjustable Sensitivity
• Wire Harness Included

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

3
List price $31.99
-38% $19.99

In stock

Only 3 Left!

• Stinger DoubleGuard Shock Sensor
• Adjustable Sensitivity
• Wire Harness Included

Sound Extreme by ECOXGEAR ACC-SERV7

1.5" to 3" Universal Roll Cage Mounting Clamps

ACC-SERV7 big
Go to item page Right Arrow Icon of Right Arrow

1.5" to 3" Universal Roll Cage Mounting Clamps

• Universal Roll-Cage Soundbar Mounting Clamps
• Designed for use in SoundExtreme soundbars (Sold separately)
• Fits in 1.5" to 3" mounting tubes
• Sold in pairs

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $129.99
-8% $119.99

In stock

Only 2 Left!

• Universal Roll-Cage Soundbar Mounting Clamps
• Designed for use in SoundExtreme soundbars (Sold separately)
• Fits in 1.5" to 3" mounting tubes
• Sold in pairs

SPL-LAB Mini Bass Meter SE (Second Edition)

Compact Sound Pressure Meter with Voltage Measure Display

Mini Bass Meter SE big
Go to item page Right Arrow Icon of Right Arrow

Compact Sound Pressure Meter with Voltage Measure Display

• Compact standalone sound pressure meter
• Measures SPL, current, maximum, and minimum voltage
• Measures speaker tunes and subwoofers
• Attachable to car windshield

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $23.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

2
List price $269.99
-15% $229.99

In stock

• Compact standalone sound pressure meter
• Measures SPL, current, maximum, and minimum voltage
• Measures speaker tunes and subwoofers
• Attachable to car windshield

Dual 12" 3/4 MDF Sealed Subwoofer Enclosure (Belva MDFD12)

Dual 12-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/Polyfil (2.46 cu ft Airspace - 12SQB)

MDFD12 big
Go to item page Right Arrow Icon of Right Arrow

Dual 12-inch Sealed Car Sub Box Made with 3/4" MDF and lined w/Polyfil (2.46 cu ft Airspace - 12SQB)

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

120
List price $119.99
-17% $99.99

In stock

• 3/4" Medium Density Fiberboard Construction
• Durable Black Carpeting
• Pre-Lined with Poly-Fil
• Gold Speaker Terminals

Pioneer ADT-VA133 Dash Kit

Install a new Double-DIN car stereo (Black)

ADT-VA133 big
Go to item page Right Arrow Icon of Right Arrow

Install a new Double-DIN car stereo (Black)

• Double-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

13
List price $60.00
-25% $44.99

In stock

Only 3 Left!

• Double-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

Belva BLPCAM2

License Plate Mounted Waterproof Rearview Backup Camera with Built in Night Vision

BLPCAM2 big
Go to item page Right Arrow Icon of Right Arrow

License Plate Mounted Waterproof Rearview Backup Camera with Built in Night Vision

• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Resolution: 720 x 480 
• Waterproof: Yes
• Nightvision: Infrared LED's

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

57
List price $99.99
-60% $39.99

In stock

Used from: $23.99

• Universal Rear View Backup Camera
• Mounting Style: Full License Plate Frame
• Resolution: 720 x 480 
• Waterproof: Yes
• Nightvision: Infrared LED's

Limited time!

Belva BASQM

Front Load Flush Mount Flange BAWPL, BA2USB, BAVTM

BASQM big
Go to item page Right Arrow Icon of Right Arrow

Front Load Flush Mount Flange BAWPL, BA2USB, BAVTM

• Front Load Flush Mount Flange
• For use with Belva BAWLk, BA2USB or BAVTM
• Color: Black
• Material: Plastic

Dads & Grads Sale! Save 15% at Checkout!
shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

2
List price $1.99
-25% $1.49

In stock

• Front Load Flush Mount Flange
• For use with Belva BAWLk, BA2USB or BAVTM
• Color: Black
• Material: Plastic

Rockford Fosgate Punch PEQ

Wired Bass/Treble Equalization Remote Controller for Select 2007-2025 Punch and Power Amplifiers

PEQ big
Go to item page Right Arrow Icon of Right Arrow

Wired Bass/Treble Equalization Remote Controller for Select 2007-2025 Punch and Power Amplifiers

• Wired Bass/Treble Remote for select 2007-2025 Punch and Power amplifiers
• Controls bass on rear outputs of 4-channel amplifiers
• Conveniently mount under dash, inside center console or glovebox

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

62
$49.99

In stock

• Wired Bass/Treble Remote for select 2007-2025 Punch and Power amplifiers
• Controls bass on rear outputs of 4-channel amplifiers
• Conveniently mount under dash, inside center console or glovebox

NVX QBSTA

900W Peak (300W RMS) 11" Spare Tire Powered Subwoofer System with Remote Bass Knob

QBSTA big
Go to item page Right Arrow Icon of Right Arrow

900W Peak (300W RMS) 11" Spare Tire Powered Subwoofer System with Remote Bass Knob

• 11" Spare Tire Subwoofer System
• Built-In Class D Amplifier
• Top-mount amplifier controls
• Speaker-Level Inputs
• Wired Remote Bass Level Control

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $27.50 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

16
List price $323.99
-15% $274.99

In stock

• 11" Spare Tire Subwoofer System
• Built-In Class D Amplifier
• Top-mount amplifier controls
• Speaker-Level Inputs
• Wired Remote Bass Level Control

Stinger SGP90200

200 Amp Circuit Breaker

SGP90200 big
Go to item page Right Arrow Icon of Right Arrow

200 Amp Circuit Breaker

• 200 Amp Circuit Breaker
• Dust and splash proof
• Accepts 1/0 or 4 gauge wire
• Easy reset/disconnect
• Can act as a master disconnect for circuits

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

7
List price $139.00
-50% $68.99

In stock

Only 1 Left!

• 200 Amp Circuit Breaker
• Dust and splash proof
• Accepts 1/0 or 4 gauge wire
• Easy reset/disconnect
• Can act as a master disconnect for circuits

NVX XQDC4

4 AWG High Current Power and Ground Quick Disconnect with Surface Mounts

XQDC4 big
Go to item page Right Arrow Icon of Right Arrow

4 AWG High Current Power and Ground Quick Disconnect with Surface Mounts

• 4 AWG Power, Ground and Remote Quick Disconnect
• Rated up to 120 Amps
• Anderson connectors
• Makes it easy to remove amps, batteries and other equipment quickly
• Includes male and female quick disconnects

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

5
List price $27.99
-7% $25.99

In stock

Used from: $15.59 Like New from: $22.09

• 4 AWG Power, Ground and Remote Quick Disconnect
• Rated up to 120 Amps
• Anderson connectors
• Makes it easy to remove amps, batteries and other equipment quickly
• Includes male and female quick disconnects

Items per page: 20 40 60

    Clear all
    why-shoping-with-sonic

    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
    Why Shop With Us?
    FAQ for Universal-Fit Audio & Electronics in 2003 FXSTD/I Softail Deuce

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2003 Harley Davidson FXSTD/I Softail Deuce?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your FXSTD/I Softail Deuce.

    Save up to 10 different vehicles in your garage
    Vehicle
    Store
    Delete

    1978 Triumph TR7

    2001 BMW 540i

    1986 Ford EXP

    1997 BMW Z3

    1997 Saab 900

    1997 Oldsmobile Cutlass

    2003 Suzuki Vitara

    2007 Kia Spectra

    2016 Buick Regal

    2018 Mazda CX-3

    Vehicle
    Store
    Delete

    2003 Harley Davidson FXSTD/I Softail Deuce

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm
    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue
    Loading...
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon

    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.