Garage
Shop

Shop all 1988 BMW 635CSi Car Audio, Speakers, & Electronics

Loading...
Filters
filter-icon Filters & Sort

Metra 44-PW530 Antenna

Universal Fully Automatic Power Antenna

44-PW530 big
Go to item page Right Arrow Icon of Right Arrow

Universal Fully Automatic Power Antenna

• Replacement Power Antenna for Select Vehicles
• Replaceable Mast
• Fully Automatic

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

empty

found car based on your search
This product fits your 1988 635CSi
2
Was $185.99 Details
$166.99

In stock

• Replacement Power Antenna for Select Vehicles
• Replaceable Mast
• Fully Automatic

Metra 44-UL15 Antenna

Locking 1-3/4" Top Mount with Key for Universal Applications

44-UL15 big
Go to item page Right Arrow Icon of Right Arrow

Locking 1-3/4" Top Mount with Key for Universal Applications

• Universal Replacement Locking Retractable Antenna
• Locking Top Mount with Key
• 48" Cable

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

empty

found car based on your search
This product fits your 1988 635CSi
1
Was $55.99 Details
$49.99

In stock

Only 3 Left!

• Universal Replacement Locking Retractable Antenna
• Locking Top Mount with Key
• 48" Cable

Limited time!

Kicker CSC65 (46CSC654)

600W Peak (200W RMS) 6.5” CS Series 2-way 4-ohm Coaxial Car Speakers (CSC654)

CSC654 big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (200W RMS) 6.5” CS Series 2-way 4-ohm Coaxial Car Speakers (CSC654)

• 300 watts Peak Each, 100 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome zero-protrusion tweeters with neodymium magnets
• Polypropylene cone material with Extended Voice Coil (EVC) technology
• Impedance: 4 ohm
• Sensitivity: 90 dB

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

Adapter/Wire Harness available and sold separately

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
108
Was $99.99 Details
Save $23.03
$76.96 /pair

In stock

Infinity Kappa 603CF (INFSPKKA603CFAM)

660W Peak (220W RMS) 6.5" Kappa Series 2 Way 3-ohm Component Speaker System

Kappa 603CF big
Go to item page Right Arrow Icon of Right Arrow

660W Peak (220W RMS) 6.5" Kappa Series 2 Way 3-ohm Component Speaker System

• 330 watts Peak Each, 110 watts RMS Each
• 3/4" Silk Edge Driven Dome Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

FREE Baffles, Damping, and More at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $40.00 in rewards to spend later

install icon

Up to $117 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
5
Was $449.95 Details
$399.95 /set

In stock

• 330 watts Peak Each, 110 watts RMS Each
• 3/4" Silk Edge Driven Dome Tweeters
• Glass Fiber cone material
• Impedance: 3 ohm
• Sensitivity: 93 dB

Sony XAV-AX8500

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

XAV-AX8500 big
Go to item page Right Arrow Icon of Right Arrow

10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)

• Single DIN Bluetooth Digital Multimedia Receiver
• 10.1" TFT Active Matrix Display
• Apple CarPlay (wireless) and Android Auto (wired and wireless) compatible
• 3 sets of 5 volts preamp outputs
• 14-Band Graphic EQ and 8-Band Parametric EQ
• SiriusXM Satellite Radio Ready
• iDatalink Maestro compatible
• Flexible installation in both single and double-DIN dashboards

FREE Backup Camera at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $79.80 in rewards to spend later

empty

found car based on your search
This product fits your 1988 635CSi
Was $899.99 Details
$798.00

In stock

Alpine UTE-73BT

Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)

UTE-73BT big
Go to item page Right Arrow Icon of Right Arrow

Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)

• Single DIN Digital Media Receiver
• 1-line Digital LED Backlit Display with RGB illumination
• Control music/other apps via iPhone and Android
• 3 sets of 2 volts preamp outputs
• 3-Band Parametric Equalizer
• SiriusXM Satellite Radio Ready
• NFC-compatible for select Android devices
• Built-in amplifier

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

empty

found car based on your search
This product fits your 1988 635CSi
33
Was $170.00 Details
$129.95

In stock

• Single DIN Digital Media Receiver
• 1-line Digital LED Backlit Display with RGB illumination
• Control music/other apps via iPhone and Android
• 3 sets of 2 volts preamp outputs
• 3-Band Parametric Equalizer
• SiriusXM Satellite Radio Ready
• NFC-compatible for select Android devices
• Built-in amplifier

Sony MEX-N5300BT

Single DIN Bluetooth/CD/MP3 In-Dash Car Stereo Receiver with NFC connectivity

MEX-N5300BT big
Go to item page Right Arrow Icon of Right Arrow

Single DIN Bluetooth/CD/MP3 In-Dash Car Stereo Receiver with NFC connectivity

• 55W x 4 Chan. MAX / 20W x 4 Chan. RMS
• 3 Sets of Preamp Outputs
• 10-Band EQ10 Eqaualizer
• Dynamic Stage Organizer optimizes the sound stage from your door panel speakers
• Time alignment maximizes music based on where you're seated, adjustable

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

empty

found car based on your search
This product fits your 1988 635CSi
2
Was $129.99 Details
$128.00

In stock

Planet Audio P70CPA-CF

7" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto

P70CPA-CF big
Go to item page Right Arrow Icon of Right Arrow

7" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto

• Single DIN In-Dash Bluetooth Digital Media Receiver
• 7" Capacitive Touchscreen Display
• Apple CarPlay and Android Auto Compatible
• 3 sets of 4 volts preamp outputs
• Built-in preset EQ

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

VIP Product Get $32.00 in rewards to spend later

empty

found car based on your search
This product fits your 1988 635CSi
$319.99

In stock

• Single DIN In-Dash Bluetooth Digital Media Receiver
• 7" Capacitive Touchscreen Display
• Apple CarPlay and Android Auto Compatible
• 3 sets of 4 volts preamp outputs
• Built-in preset EQ

JBL Stage3 427F (STAGE3427FAM)

300W Peak (60W RMS) 4" Stage3 Series 2-way Coaxial 3-ohm Speakers

Stage3 427F big
Go to item page Right Arrow Icon of Right Arrow

300W Peak (60W RMS) 4" Stage3 Series 2-way Coaxial 3-ohm Speakers

• 150 watts Peak Each, 30 watts RMS Each
• Edge-driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 90 dB

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

Up to $18 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Dash Corner
3
Was $89.95 Details
$69.95 /pair

In stock

• 150 watts Peak Each, 30 watts RMS Each
• Edge-driven Dome tweeters
• Polypropylene cone material
• Impedance: 3 ohm
• Sensitivity: 90 dB

Alpine R2-S652

600W Peak (200W RMS) 6.5" R-Series PRO 2-way 4-ohm Hi-Res Component Speaker System

R2-S652 big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (200W RMS) 6.5" R-Series PRO 2-way 4-ohm Hi-Res Component Speaker System

• 300 watts Peak Each, 100 watts RMS Each
• 1" Magnesium Hard Dome tweeters
• Reinforced Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

FREE Speaker Baffles at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $40.00 in rewards to spend later

install icon

Up to $117 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
Was $450.00 Details
$399.95 /set

In stock

• 300 watts Peak Each, 100 watts RMS Each
• 1" Magnesium Hard Dome tweeters
• Reinforced Glass Fiber cone material
• Impedance: 4 ohm
• Sensitivity: 88 dB

Hertz CK 165 L

600W Peak (200W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

CK 165 L big
Go to item page Right Arrow Icon of Right Arrow

600W Peak (200W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

• 300 watts Peak Each, 100 watts RMS Each
• 1" Tetolon Soft Dome tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

FREE Baffles, Damping, and More at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $40.00 in rewards to spend later

install icon

Up to $117 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
1
Was $450.00 Details
$399.99 /set

In stock

Only 1 Left!

• 300 watts Peak Each, 100 watts RMS Each
• 1" Tetolon Soft Dome tweeters
• Non-Pressed Paper cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

Hertz CK 165

570W Peak (190W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

CK 165 big
Go to item page Right Arrow Icon of Right Arrow

570W Peak (190W RMS) 6.5" Cento Series 2-way 4-ohm Component Speaker System

• 285 watts Peak Each, 95 watts RMS Each
• 1" Tetolon Soft Dome tweeters with neodymium magnets
• Semi-Pressed paper with Mica cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

FREE Baffles, Damping, and More at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $40.00 in rewards to spend later

install icon

Up to $117 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
Was $450.00 Details
$399.99 /set

In stock

• 285 watts Peak Each, 95 watts RMS Each
• 1" Tetolon Soft Dome tweeters with neodymium magnets
• Semi-Pressed paper with Mica cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

JL Audio C1-650se

450W Peak (100W RMS) 6.5" C1 Series 2-Way 4-ohm Component Speaker System

C1-650se big
Go to item page Right Arrow Icon of Right Arrow

450W Peak (100W RMS) 6.5" C1 Series 2-Way 4-ohm Component Speaker System


• 50 watts RMS Each
• 1" Silk Dome Tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

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

install icon

Up to $50 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
$229.99 /set

In stock


• 50 watts RMS Each
• 1" Silk Dome Tweeters
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 91 dB

JVC KD-T720BT

Single-DIN CD Multimedia Receiver with Bluetooth and Built-in Alexa

KD-T720BT big
Go to item page Right Arrow Icon of Right Arrow

Single-DIN CD Multimedia Receiver with Bluetooth and Built-in Alexa

• Single DIN Bluetooth CD Digital Multimedia Receiver with USB and AUX
• LCD Text Display
• 1 sets of 2.5 volts preamp outputs
• 13-Band Graphic Equalizer with 11 Selectable Presets

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

empty

found car based on your search
This product fits your 1988 635CSi
Was $169.00 Details
$149.00

In stock

• Single DIN Bluetooth CD Digital Multimedia Receiver with USB and AUX
• LCD Text Display
• 1 sets of 2.5 volts preamp outputs
• 13-Band Graphic Equalizer with 11 Selectable Presets

Rockford Fosgate Punch P1650

220W Peak (110W RMS) 6.5" Punch P1 Series 2-way 4-ohm Coaxial Speakers

P1650 big
Go to item page Right Arrow Icon of Right Arrow

220W Peak (110W RMS) 6.5" Punch P1 Series 2-way 4-ohm Coaxial Speakers

• 110 watts Peak Each, 55 watts RMS Each
• 3/4" PEI (Polyetherimide) Dome tweeters
• Mineral-Filled Polypropylene cone material with Vertical Attach Surround Technique (VAST)
• Impedance: 4 ohm
• Sensitivity: 88 dB

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

VIP Product Get $11.00 in rewards to spend later

install icon

Up to $80 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
59
$109.99 /pair

In stock

• 110 watts Peak Each, 55 watts RMS Each
• 3/4" PEI (Polyetherimide) Dome tweeters
• Mineral-Filled Polypropylene cone material with Vertical Attach Surround Technique (VAST)
• Impedance: 4 ohm
• Sensitivity: 88 dB

JL Audio C1-650x

150W Peak (100W RMS) 6.5" Evolution C1 Series 2-way 4-ohm Coaxial Car Speakers

C1-650x big
Go to item page Right Arrow Icon of Right Arrow

150W Peak (100W RMS) 6.5" Evolution C1 Series 2-way 4-ohm Coaxial Car Speakers

• 75 watts Peak Each, 50 watts RMS Each
• 3/4" Silk-suspended Aluminum Dome ferrofluid-cooled tweeters with neodymium magnets
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

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

VIP Product Get $12.00 in rewards to spend later

install icon

Up to $59 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
30
$119.99 /pair

In stock

• 75 watts Peak Each, 50 watts RMS Each
• 3/4" Silk-suspended Aluminum Dome ferrofluid-cooled tweeters with neodymium magnets
• Mineral-Filled Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 93 dB

Cerwin-Vega V465

800W Peak (150W RMS) 6.5" Vega Series 2-way Coaxial Car Speakers

V465 big
Go to item page Right Arrow Icon of Right Arrow

800W Peak (150W RMS) 6.5" Vega Series 2-way Coaxial Car Speakers

• 400 watts Peak Each, 75 watts RMS Each
• 1" Titanium Dome tweeters
• Curvilinear Mica Fiber Composite cone material
• Impedance: 4 ohm
• Sensitivity: 94 dB

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

VIP Product Get $11.00 in rewards to spend later

install icon

Up to $40 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
27
Was $129.99 Details
$109.99 /pair

In stock

JBL GX608C (GX608CAM)

420W Peak (140W RMS) 6.5” GX Series 2 Way 2.3-ohm Component Speaker System

GX608C big
Go to item page Right Arrow Icon of Right Arrow

420W Peak (140W RMS) 6.5” GX Series 2 Way 2.3-ohm Component Speaker System

• 210 watts Peak Each, 70 watts RMS Each
• 1-13/16" Edge Driven Dome tweeters
• Polypropylene cone material
• Impedance: 2.3 ohm
• Sensitivity: 92 dB

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

Up to $28 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
5
Was $119.99 Details
$99.99 /set

In stock

Memphis Audio MJP6C

500W Peak (250W RMS) 6.5" Mojo Pro Series 2-way 4-ohm Motorcycle and ATV/UTV Component Speaker System

MJP6C big
Go to item page Right Arrow Icon of Right Arrow

500W Peak (250W RMS) 6.5" Mojo Pro Series 2-way 4-ohm Motorcycle and ATV/UTV Component Speaker System

• 250 watts Peak Each, 125 watts RMS Each
• 1" Aluminum Dome tweeters
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 95 dB

FREE Baffles, Damping, and More at Checkout! Shop deal
shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $39.00 in rewards to spend later

install icon

Up to $94 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
Was $509.95 Details
$389.95 /set

In stock

Only 3 Left!

• 250 watts Peak Each, 125 watts RMS Each
• 1" Aluminum Dome tweeters
• Paper cone material
• Impedance: 4 ohm
• Sensitivity: 95 dB

Kicker DSC650 (43DSC6504)

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

DSC650 big
Go to item page Right Arrow Icon of Right Arrow

480W Peak (120W RMS) 6.5” DS Series 2-way 4-ohm Coaxial Car Speakers (DSC6504)

• 240 watts Peak Each, 60 watts RMS Each
• 1/2" PEI (Polyetherimide) Balanced Dome zero-protrusion tweeters
• Polypropylene cone material
• Impedance: 4 ohm
• Sensitivity: 90 dB

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

VIP Product Get $8.00 in rewards to spend later

install icon

Up to $9 savings on install accessories you need

found car based on your search
Fits the following location in your 1988 635CSi
  • Rear Deck Corner
26
Was $89.99 Details
$79.99 /pair

In stock

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 your 1988 635CSi

    Q: Can I upgrade the factory stereo system in my 1988 BMW 635CSi?

    A: Yes you can improve your sound in your 635CSi by upgrading your speakers and/or adding an amplifier. You may also be able to update the stereo and main display in your 1988 635CSi if there is a dash kit and harness solution available.

    Save up to 10 different vehicles in your garage

    1988 BMW 635CSi

    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