Free Shipping offer applies to orders over $200.00 to the 48 states via UPS Ground or USPS Priority. Offer Excludes shipments to Alaska, Hawaii and Military Boxes. Items that are too large to ship via UPS or USPS are excluded from this offer.Please read more on our full shipping policy View Shipping Policy
The hardware you will need when installing this on a WRX or 04-05 STI is as follows:
1x CUS 672 487 S
1x CUS 673 487 A
4x SUB 901000365
RallySport Guarantee - 30 Days
Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.
RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.
The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
illysti 2 years ago
So much easier to order it here, than from the dealer. I did have to trim it a bit to make sure it didnt hit my aftermarket exhaust. Looks great!
tim95211 3 years ago
I admit I bought this mostly for looks, but I got the added benefit of a stiffer rear end with the Cusco rear subframe brace. Pretty good quality and fit is dead on.
bladesti 3 years ago
Looks great on the car! Love it! Thank you rsd
chrispy bacon 4 years ago
Once i got the Cusco sub-Frame bar and brackets install, this thing took seconds to install. It just complete the back end. Love it! Thanks RSD !!
02-07 JDM Rear Diffuser
cmartin 4 years ago
I installed the rear diffuser on my 2004 wrx, fitment was perfect with the bracket, remember to buy 4 bolts for the diffuser also. Pretty simple to install, also fit with my aftermarket exhaust
Q: 2005 sti diffuser Marsden87 15 days agoAnswer
I want to purchase the diffuser for my 2005 impreza sti; but as you noted, it needs the bolts and frames/mounting plates. Do you sell this as a complete package and how do i ascertain the cost?
A: As noted in the product description: The hardware you will need when installing this on a WRX or 04-05 STI is as follows: 1x CUS 672 487 S 1x CUS 673 487 A 4x SUB 901000365
Josh P. 14 days ago
Q: Bolts coffey171878590 4 months agoAnswer
Does this come with new bolts also?
A: No, the bolts are not included. You would need x4 SUB 901000365SUB. You will also need CUS 673 487 A and CUS 672 487 S if installing on a 02-05 WRX or 04-05 STI.
Evan M. 4 months ago
Q: Fitment 07RS 5 months agoAnswer
What all would it take to get this to fit on a 2007 Impreza?
A: We do not have a confirmed fit for 2007 NA Impreza models and it would likely require custom brackets and installation.
Nick S. 5 months ago
Q: Suitable for 2006 WRX Wagon Jackie.C 6 months agoAnswer
I would like to know, is it fit for 2006 wrx wagon thx a lot
A: This is not confirmed for the 2006 WRX models.
Nick S. 6 months ago
Q: Fitment Sonic yellow wrx 8 months agoAnswer
Will it fit my sonic yellow 03 wrx