Subaru Speaker Adapter Kit 5.25" - Rear Pre 2008

Subaru Speaker Adapter Kit 5.25" - Rear Pre 2008


Made in the USA and reviewed across several publications, Subiesport, IWSTi, and NASIOC, the ia-Performance stereo speaker install kits is one of the most innovative kits on the market. These are constructed of Polycarbonate, which is 2x stronger than ABS, commonly found in other brands. Their universal design allows the adapters to be stacked, or even flipped, to meet the mounting depth and cutout diameter needs of each speaker. 

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FACT: The factory Subaru door design significantly limits the speaker options to the point of having next to no aftermarket choices.

Through the implementation of our injected molded adapters, you now have the option of running virtually any aftermarket speaker while maintaining the factory door covers*. Plus, the ease of which our kit installs will make anyone feel like a pro (no cutting nor drilling required). 


  • 2 rear door adapters, enough to fit 2 speakers.
  • Comprehensive installation kit  

Our adapter kits are designed to work with speakers within the following size dimensions. Please refer to the manufacturer's website for your model's dimensions. 

See the above APPLICATIONS and FAQ tabs for additional info.

Rear Doors (5.25") 

  • Cutout Diameter: 0"- 4.6" (over this size and metal cutting of the door skin may be necessary)
  • Mounting Depth: 0" - 2.92"
  • Tip: when shopping for coaxial rear speakers, find one that has a flush mounted tweeter, versus a tweeter that extends past the woofer body. This will make for an easier install. 

    *Note: our adapters fit speakers meeting the size requirement chart above. These sizes fit 99% of all speakers in the mainstream market. Please consult with your speakers' manufacturer for fitment dimensions.

    • Subaru Impreza 2002-2007 Rear doors, only fits the rear
    • Forester 1999-2006 models that arrived with a factory 4" rear speaker
    • Forester 2007-2008, will fit but requires inserting the adapter plate's two lower screws at an angle loosely, then tighten down. Alternatively,  the 2 lower mounting holes can be moved slightly which requires a drill and 3/16" drill bit.
    • Saab 92-x, rear door 2005-2006

    Q: Where are the kits made?
    A: The adapter rings are made in the USA with ia-Performance's proprietary mold and the final packaging occurs at our Colorado USA office.

    Q: Why do the 6.5" (front and rear) and 5.25" (front only) kits come with 4 rings for just 2 doors?
    A: The adapter plates have a beveled interior circle, which allows for various stacking configurations to accommodate a vast array of speaker cutout diameters.    


    Q: What are the adapter plates made out of?
    A: The rings are injected molded reinforced polycarbonate (stronger than ABS) 

    View the full installation guide here

    International Shipping Discount Alert

    Due to the small size, we are able to ship this product in a flat rate padded envelope for less than the website estimates. Depending on the country, expect to save $10-15 USD. In order to receive a discount code we will need to receive an email with your Ship To address.

    Australia = $49 website, $39 after discount

    Canada = $37 website, $28 after discount


    • The discount only applies to select small products (primarily speaker adapter kits)
    • Offer is only valid with USPS Priority Mail
    • Discount offer may not be valid for all countries

    Customer Reviews

    Based on 3 reviews
    Britton Cannell
    1998 legacy outback wagon

    The rear door on the wagons have speakers. I believe the 6.5 mount would have worked better but I used the existing speaker mount with this to make it all work. Overall worked well but definitely needed modifications to work. But for $15 you can't go wrong definitely made installation easier.

    Installed these in a 2007 Forester, not a perfect fit but way easier than boring new holes in my ...

    Just up front I am giving these 4 stars because they did not perfectly line up with the pre-existing holes in my rear doors. It was the matter of 5 minutes work to bore new holes with a power drill to fit them in and saved me the much greater work of having to bore new holes in the actual door. The material seems very sturdy and I was even able to use the original screws. Considering that my next car will likely be another Subie I will certainly be buying from ia Again.

    Bernie Wojciak
    100% fit.

    100% fit. I was going down that road. I made one protype. I seen your web site and bought a set. Thru my protype way. Good product.

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