Cusco Diffuser Bracket

Part #: CUS 672 487 S
MSRP: $51.00
( 11 reviews )


   In Stock: Ships the Same Day
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No questions asked 30 day return policy


Brand: Cusco
Color: Black
Installation Location: Rear
Installation Method: With Cusco Rear Lower Bar
Material: Metal
Mounts To: Chassis
Mfgr. Warranty: No Warranty
Return Policy:

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Subaru Impreza
WRX STI 2004, 2005, 2006, 2007WRX STI Limited 2007WRX 2002, 2003, 2004, 2005, 2006, 2007WRX TR 2006, 2007WRX Limited 2006, 2007

The STI Rear Diffuser came standard on the 06-07 USDM STi. It channels the air underneath the car to help with high speed stability. You can either purchase the diffuser alone if your car already came with one from the factory or you can purchase the additional hardware in order to bolt it onto your vehicle. This is the bracket that allows for installation of the diffuser on 02-07 WRX and STi. Also needed are the 4 bolts and Cusco Rear Subframe bar.

REVIEWS ( 11 )


Verified Purchase
04 STI
illysti 1 year ago
solid piece.. you do need two bolts to secure one of the brackets.

Simple install
Stickle 2 years ago
As stated below. Will need two bolts and two locking nuts for the rear bar attached near bumper area. As they are not included with the support bars. Also a 4mm allen head key is needed for the four front screws.
Verified Purchase
WICKED02WRX38229 2 years ago
easy install!
Verified Purchase
imoru200390870 2 years ago
This product is really great and installation was easy, even though the instructions were in Japanese.
Verified Purchase
bladesti 2 years ago
These make installing the rear diffuser so easy! Thank you rsd


  • AnswerQ: 05 wagon  deibsorama 10 months ago

    Will it bolt to a cobb strut bar?

    • A: This does not attach to the strut bar. It will attach using the Cusco rear subframe bar.

      Josh P. 10 months ago

  • AnswerQ: Hardware required?  Subenoob420 3 years ago

    Does this come with required hardware (fasteners) or do I use existing hardware already on the vehicle? If required hardware is not included, what do I require? Thanks.

    • A: To install the diffuser you still need the following 1x CUS 673 487 A 4x SUB 901000365 Along with the diffuser itself.

      Kirill C. 3 years ago

  • AnswerQ: 04 wrx fitament   ctom24 4 years ago

    What would I need to get this to fit on my 04 wrx?

    • A: You would also want to get the Cusco rear lower sub frame bar, the STi diffuser, the STi diffuser bolts, and this product itself, and it will all bolt up just like stock to give you the OEM diffuser. Thanks.

      Rick C. 4 years ago

  • AnswerQ: lower subframe bar  sendrac48124 4 years ago

    Will I need the lower subframe bar on my 05' STI?

    • A: Yes, the Cusco lower subframe bar will be necessary in order to mount the STI rear diffuser to your vehicle.

      Matt G. 4 years ago

  • AnswerQ: 07 2.5i  Mustardman 4 years ago

    Is this all I need to mount the STi JDM rear diffuser on to my 07 2.5i? And will this work with any aftermarket diffusers as well?

    • A: Hello, You will also need the Cusco rear lower subframe bar, the STi JDM diffuser, and the STi diffuser bolts as well. And I am not sure if this setup will work with the aftermarket diffuser, but it is guaranteed to work with the OEM diffuser on the WRX and STi.

      Rick C. 4 years ago