2018 BMW 3 Series stereo and speaker fit
In the 2018 BMW 3 Series, the factory radio can't be swapped for a standard aftermarket stereo, so the usual upgrade is speakers, an amp, a processor or a sub. Factory speaker sizes: 4" front doors and rear doors. DJ Custom Audio in South Gate stocks stereos and speakers that fit and installs them in its own bay, often the same day.
What fits the 2018 BMW 3 Series
| Vehicle | Dash opening | Front doors | Center dash | Rear doors |
|---|---|---|---|---|
| 2018 BMW 3 Series | Factory radio can't be swapped for a standard aftermarket stereo ✓ Verified | 4" ✓ Verified | Confirm at the shop | 4" ✓ Verified |
In stock in South Gate
Gear for the 2018 BMW 3 Series
Pick your exact year and trim in Shop by vehicle; Tony confirms the fit before you buy.
Install notes for the 2018 BMW 3 Series
- Some trims have factory Harman Kardon premium sound, which can wire differently; Tony checks your trim before you buy.
- Not confirmed yet: center dash. These say "Confirm at the shop" until our sources agree; Tony checks them with your trim.
Local pickup and install in South Gate
Everything is picked up at the shop, Cash & Carry: 8696 Atlantic Ave, South Gate. Buy Now, Pay Later with the Payment Plan (Snap, EasyPay, Synchrony, American First). Approval and terms set by the provider.
Sizes marked "Confirm at the shop" are ones our sources do not agree on yet, or that change by trim or premium audio. Tony checks before you buy. Fit data checked against Metra dash kit and speaker guides and Alpine vehicle fitment data and Crutchfield vehicle research.
Speaker upgrade
More for your BMW 3 Series
BMW 3 Series speaker upgrade guide
Car guides: Keeping the factory radio · Speakers, sub or amp: where to start
Other BMW 3 Series years
- 2026 BMW 3 Series · 2024–2025 BMW 3 Series · 2023 BMW 3 Series · 2020–2022 BMW 3 Series · 2019 BMW 3 Series · 2017 BMW 3 Series · 2014–2016 BMW 3 Series · 2012–2013 BMW 3 Series · 2007–2011 BMW 3 Series · 2006 BMW 3 Series
2018 BMW 3 Series stereo and speaker fit: questions
What size speakers are in the 2018 BMW 3 Series?
4" front doors and rear doors. We stock speakers in these sizes in South Gate and install them.
Does the 2018 BMW 3 Series have a premium sound system?
Some trims have factory Harman Kardon premium sound, which can wire differently. Tony checks your trim before you buy.
Are all the speaker sizes for the 2018 BMW 3 Series confirmed?
Not yet: center dash still say "Confirm at the shop". Text (213) 674-9042 with your trim and Tony will check.
Can DJ Custom Audio install it?
Yes. Bring the 2018 BMW 3 Series to 8696 Atlantic Ave, South Gate. Tony confirms the trim and installs in our own bay, often the same day. Text (213) 674-9042 or call (323) 944-7844.