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2018 Audi S3

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 2018 Audi S3

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.

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Stinger SPT522

Gauge Reducer, 4 Gauge Input to 8 Gauge Pin

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Gauge Reducer, 4 Gauge Input to 8 Gauge Pin

• Gauge Reducer Adapter
• 4 Gauge Input to 8 Gauge Pin
• Deep Wire Recesses
• Ultimate Power Delivery
• Corrosion Resistant Chrome Plating

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List price $19.00
-47% $9.99

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• Gauge Reducer Adapter
• 4 Gauge Input to 8 Gauge Pin
• Deep Wire Recesses
• Ultimate Power Delivery
• Corrosion Resistant Chrome Plating

NVX XKIT82

Full Spec 8 Gauge 100% (OFC) Oxygen Free Copper Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 800 Watts

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Full Spec 8 Gauge 100% (OFC) Oxygen Free Copper Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 800 Watts

• Complete 8 Gauge Amplifier Installation Kit
• For Amplifiers Up To 800 Watts RMS
• 100% (OFC) Oxygen Free Copper
• Dual Twisted Pair 2-Channel RCA Cable
• Tinned conductors for corrosion resistance
• Pre-terminated seamless power and ground ring terminals
• ANL/Mini-ANL Fuse Holder with 60 amp fuse
• CEA-2015 and BC5W2 Compliant

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Available Offers (4) for NVX XKIT82
FREE NVX Amp Kit at Checkout!
Save 30% off an NVX XKIT82 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT82 Amp Kit! 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.
Purchase $400 or More of NVX and Save 15%!
2026-07-27 11:08:20
NVX - Worth the Envy - Direct to Consumer Car Audio

Stinger SSVLP0BL

50 ft. 1/0 Gauge Power Wire (Matte Blue)

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50 ft. 1/0 Gauge Power Wire (Matte Blue)

• 50 feet 1/0 gauge Power Wire
• CCA (Copper-Clad Aluminum) material
• Ultra flexible CCA cable construction
• Color: Matte Blue

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List price $269.00
-37% $169.00

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• 50 feet 1/0 gauge Power Wire
• CCA (Copper-Clad Aluminum) material
• Ultra flexible CCA cable construction
• Color: Matte Blue

JL Audio MMC-2Y

2-way Y-splitter for MediaMaster remote controllers

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2-way Y-splitter for MediaMaster remote controllers

• Use to connect multiple MediaMaster Remote Controllers
• 2-way Y-splitter

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$34.99

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• Use to connect multiple MediaMaster Remote Controllers
• 2-way Y-splitter

Limited time!

NVX VCW152v3RC

Recone Kit for VCW152v3 Version 3 Subwoofers

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Recone Kit for VCW152v3 Version 3 Subwoofers

• Kits are assembled to ensure perfect fitment and alignment
• Each kit includes all new soft moving parts
• Impedance: Dual 2-ohm
• CA glue adhesive is NOT included

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List price $131.99
-17% $109.99

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• Kits are assembled to ensure perfect fitment and alignment
• Each kit includes all new soft moving parts
• Impedance: Dual 2-ohm
• CA glue adhesive is NOT included

NVX XKIT42

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Complete 2-Channel Amplifier Wiring Kit with RCA for Amplifiers up to 1500 Watts

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Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Complete 2-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 2-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

3+ offers available
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Available Offers (3) for NVX XKIT42
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.
Purchase $400 or More of NVX and Save 15%!
2026-07-27 11:08:20

NVX XAPK4

Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Amplifier Power Wiring Kit with Speaker Wire for Amplifiers up to 1500 Watts

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Full Spec 4 Gauge 100% (OFC) Oxygen Free Copper Amplifier Power Wiring Kit with Speaker Wire for Amplifiers up to 1500 Watts

• 4 Gauge Power Amplifier Installation Kit
• For Amplifiers Up To 1500 Watts RMS
• 100% (OFC) Oxygen Free Copper
• 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

3+ offers available
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Available Offers (3) for NVX XAPK4
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.
Purchase $400 or More of NVX and Save 15%!
2026-07-27 11:08:20

Cerwin Vega HS102D

800W Peak (200W RMS) 10" HED Series Dual 2-ohm Shallow Subwoofer

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800W Peak (200W RMS) 10" HED Series Dual 2-ohm Shallow Subwoofer

• Peak Power: 800 watts
• RMS Power: 200 watts
• Impedance: Dual 2 ohm
• Polypropylene Cone
• Treated Foam Surround
• Mount depth: 3.54"
• Sensitivity: 83.1 dB

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Deaf Bonce MFA 4.220

1320W RMS Class D Machete Series 4 Channel Car Amplifier

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1320W RMS Class D Machete Series 4 Channel Car Amplifier

• 220 watts x 4 channel @ 4 ohm
• 330 watts x 4 channel @ 2 ohm
• Bridged: 660 watts x 2 channel @ 4 ohm
• Total RMS Power: 1320 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Available Offers (2) for Deaf Bonce MFA 4.220
FREE Belva Amp Kit at Checkout!
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.

Deaf Bonce Apocalypse ATOM-900.2 PRO

900W RMS Class D Apocalypse Atom Pro Series 2-Channel Full Range Car Amplifier

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900W RMS Class D Apocalypse Atom Pro Series 2-Channel Full Range Car Amplifier

• 350 watts x 2 channel @ 4 ohm
• 510 watts x 2 channel @ 2 ohm
• 900 watts x 2 channel @ 1 ohm
• Bridged: 1020 watts x 1 channel @ 4 ohm
• 1000 watts @ 2 ohm
• Total RMS Power: 900 watts
• Class D 1 ohm Stable 2-Channel-Channel Amplifier

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$229.90

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PAC BB-2PR (Green)

Pair of Bass Blockers Designed for 6" Speakers (Blocks 0-600Hz at 4 ohms, 0-300Hz at 8 ohms)

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Pair of Bass Blockers Designed for 6" Speakers (Blocks 0-600Hz at 4 ohms, 0-300Hz at 8 ohms)

• Pair of Bass Blockers For 6" Speakers
• Blocks 0-600 Hz @ 4 Ohm
• Blocks 0-300 Hz @ 8 Ohm
• Encased in Durable Plastic Casing
• Handles Power up to 50 Watts

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-41% $16.99

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• Pair of Bass Blockers For 6" Speakers
• Blocks 0-600 Hz @ 4 Ohm
• Blocks 0-300 Hz @ 8 Ohm
• Encased in Durable Plastic Casing
• Handles Power up to 50 Watts

Limited time!

JL Audio JD400/4

400W RMS Class D JD Series 4 Channel Car Amplifier

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400W RMS Class D JD Series 4 Channel Car Amplifier

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Save 30% off an NVX XKIT44 Amp Kit at Checkout!
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NVX XKIT44

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AudioControl DM-RTA PRO KIT

Real Time Analyzer and Multi-Test Tool Kit

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Real Time Analyzer and Multi-Test Tool Kit

• Real time analyzer and multi-test tool
• Balanced line level inputs and outputs
• Unbalanced line level inputs and outputs
• Speaker level inputs (handles up to 400 watts)
• Connects to PC/Mac, phone, or tablet

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• Real time analyzer and multi-test tool
• Balanced line level inputs and outputs
• Unbalanced line level inputs and outputs
• Speaker level inputs (handles up to 400 watts)
• Connects to PC/Mac, phone, or tablet

JL Audio STACK KIT-3

Stacking Hardware for 3 Slash v2 & v3 Amplifiers

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Stacking Hardware for 3 Slash v2 & v3 Amplifiers

Stacking Hardware for Three Slash v2 Amplifiers
• Made With JL Audio High Quality
• Precision Machined
• Colored Black

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Stacking Hardware for Three Slash v2 Amplifiers
• Made With JL Audio High Quality
• Precision Machined
• Colored Black

BOYO Vision VTSR100

Rear Parking Assist System with 4 Parking Sensors (Silver)

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Rear Parking Assist System with 4 Parking Sensors (Silver)

• Rear parking sensors with waterproof connectors
• Audible buzzer with volume adjustment
• Total Number of Sensors: 4
• Detection Distance: 1 feet to 5.9 feet

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• Rear parking sensors with waterproof connectors
• Audible buzzer with volume adjustment
• Total Number of Sensors: 4
• Detection Distance: 1 feet to 5.9 feet

JL Audio MMC-6

6 ft. MediaMaster remote controller cable

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6 ft. MediaMaster remote controller cable

• Media Master Remote controller cable
• 6-foot Extension Cable

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$34.99

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• Media Master Remote controller cable
• 6-foot Extension Cable

Metra MPS-RGBC-4

Water-Resistant RGB LED Controller for MPS-RGBWWS4

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Water-Resistant RGB LED Controller for MPS-RGBWWS4

• Water-resistant RGB LED Controller
• Designed in tandem with RGB MPS app
• Select from 10 speeds and 20 modes
• Sync LED to your music via Smartphone Bluetooth feature
• Compatible with MPS-RGBWWS4 (Sold separately)

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Rockford Fosgate Prime R2 R2-1200X1

1200W RMS Class D Prime Series Monoblock Car Amplifier

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1200W RMS Class D Prime Series Monoblock Car Amplifier

• 400 watts x 1 channel @ 4 ohm
• 800 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

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Available Offers (2) for Rockford Fosgate Prime R2 R2-1200X1
FREE NVX Amp Kit at Checkout!
Save 30% on an NVX XKIT42 Amp Kit with Purchase! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT42 Amp Kit! No code needed — discount applies automatically at checkout.
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JBL SHOCK WAVE 4T

140W Peak (70W RMS) 4" 4-ohm Pro Audio Bullet Horn Tweeters

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140W Peak (70W RMS) 4" 4-ohm Pro Audio Bullet Horn Tweeters

• 4" Titanium Pro-Audio Bullet Horn Super Tweeters
• 70 watts Peak Each
• 35 watts RMS Each
• 4 ohm Impedance

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• 4" Titanium Pro-Audio Bullet Horn Super Tweeters
• 70 watts Peak Each
• 35 watts RMS Each
• 4 ohm Impedance

Deaf Bonce MFA 4.180

1080W RMS Class D Machete Series 4 Channel Car Amplifier

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1080W RMS Class D Machete Series 4 Channel Car Amplifier

• 180 watts x 4 channel @ 4 ohm
• 270 watts x 4 channel @ 2 ohm
• Bridged: 540 watts x 2 channel @ 4 ohm
• Total RMS Power: 1080 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Available Offers (2) for Deaf Bonce MFA 4.180
FREE Belva Amp Kit at Checkout!
Save 30% off an NVX XKIT44 Amp Kit at Checkout! Add a qualifying amplifier to your cart and save 30% on the NVX XKIT44 Amp Kit! No code needed — discount applies automatically at checkout.
NVX - Worth the Envy - Direct to Consumer Car Audio

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    FAQ for Universal-Fit Audio & Electronics in 2018 S3

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2018 Audi S3?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your S3.

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

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