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Kartboy Big Brake Adapters FHI 2 Pot Rear (Part Number: )
Kartboy Big Brake Adapters FHI 2 Pot Rear (Part Number: )
Kartboy Big Brake Adapters FHI 2 Pot Rear (Part Number: )
Kartboy Big Brake Adapters FHI 2 Pot Rear (Part Number: )
Kartboy Big Brake Adapters FHI 2 Pot Rear
Subaru Models (inc. 2002-2005 WRX)

Features & Product Details

One of the many great attributes of the 06-07 WRX is the brakes! If only you could have a set of FHI Calipers on your 02-05 WRX, or GC Impreza then life would be complete! Well now you can do just that.

Kartboy has designed a quality big brake adapter so that you can run the FHI Calipers on the rear of your WRX, RS, and some choice Forester and Legacy models. These adapter kits will come provided with all the mounting hardware which includes high-grade bolts which will hold up to all the horsepower you will be running.

Please note that mounting these calipers also requires the use of 06-07 WRX rear rotors, and of course the proper calipers to make for a complete installation.


Brand: Kartboy
Color: Black
Installation Hardware Included: Yes
Location: Rear Caliper
Material: Alumnium
Mfgr. Warranty: Limited Lifetime Warranty
Condition: New Product
Return Policy:

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.
RallySport Guarantee



8 Reviews
4.1 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
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1 of 1 people found the following review helpful
not perfect, but does the job 3 years ago
4out of 5stars

i had to use a metal file on the knuckles to get the adapter to work properly, and i needed about an inch of spacers per bolt to keep them from contacting the rotors. not a deal breaker, but not ideal either. if you make a run to the hardware store before hand and know what you're in for, it's a pretty easy install, and they're much easier to install that swapping out knuckles. overall, i'm happy with them.
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0 of 4 people found the following review helpful
1out of 5stars

I bought these brakets after I was told these would allow me to bolt up the 04 sti rear breaks on my 02 wrx.THIS IS NOT TRUE. they don't work and I have to pay shipping to send them back now and cannot bolt up the rears. Would not recommend. I love RSD but this is crap.
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2 of 2 people found the following review helpful
Hope you get lucky 4 years ago
4out of 5stars

I've read a few reviews. Some say no fitment issues others say there are. I installed them and definitely had fitment issues with the bolt holes that attach to the e-brake back plate. Not a huge deal to remedy I just think if you're paying this much you shouldn't have to deal with anything. Still a great product and a cheaper alternative to replacing the backing plates with 06-07 plates.
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Worked wonderfully 5 years ago
5out of 5stars

Bolted on directly. Passenger side bolted on without any issue. Drivers side took a modification, but ended up bolting on just fine. Very pleased with the overall construction and hardware. Definitely recommend this to anyone wanting to upgrade their brakes.
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Forester XTi 2007 brake upgrade 6 years ago
5out of 5stars

Brilliant stuff Kartboy, upgrade to 4 pot fronts and 2 pot rears finished without any problems at all. Adaptors fitted perfectly on rear and I like the finish. Very factory in appearance. Heartily recommend to others.
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  • Q: adapters  michaelkenechuk381833 years ago

    hey I'm about to purchase some 4 pots for my 03 wrx, the brakes i plan on purchasing actually come with rotors, my question is will the rotors line up or will i still need this adaptor. i apologize if this is a dumb question I'm knew to the brake modifying world and i don't want to have to drop an extra 200 if its not necessary. thank you for your time
    • 0 of 0 people found the following answer helpful

      A:  You will want to use rotors that are specific to the calipers, and the fronts should not need an adapter. These adapters are only for bolting on the rear 2 pot calipers.

      Zach G. @ RallySport Direct 3 years ago  
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  • Q: 16 inch wheels?  Compass Motorsports4 years ago

    I have a 2000 Impreza RS will these fit with my stock 16 inch wheels or do I need bigger wheels?
  • Q: BRZ upgrade  K94 years ago

    Are these the adapters that will let the 2 pot callipers from the 06 wrx to fit the BRZ? Thanks
    • 0 of 0 people found the following answer helpful

      A:  Unfortunately we have not been able to confirm fitment with the BRZ/FRS at this time.

      Nick S. @ RallySport Direct 4 years ago  
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  • Q: E brake  bddilse811815 years ago

    Will the stock e brake still work
    • 0 of 0 people found the following answer helpful

      A:  As long as you use rotors that have the same parking brake dimensions as stock, the parking brake will still be functional.

      Zach G. @ RallySport Direct 5 years ago  
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  • Q: 4/2 Pot setup on '06 STi  gregroot1985215 years ago

    I've been told that here a set of Kartboy brackets required for the 4/2 pot downgrade on an '06 STi, these are the only ones I've come across. Do you, or anyone else, know if these are the part, or if there is a different part? Cheers!
    • 1 of 1 people found the following answer helpful

      A:  No you do not need these adapters to do the downgrade, you will however need custom 5X114.3 WRX size front rotors, and custom rear 5X114.3 rotors that will work with the STi larger parking brake.

      Kirill C. @ RallySport Direct 5 years ago  
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