• 15+ Years of Performance Parts, Tuning & Installation

STM Lightweight Rear Drag Brake Kit for 15-21 WRX/05-21 STi

  • Backed by real installs and tuning experience at FAST of West Chester
Select Rotor Style:

Everyday Low Price:

$1,140.00
$1,140.00
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STM Rear Drag Brake Kits for 2015-2021 WRX and 2005-2021 STi allow you to ditch the weight of your big, heavy stock rotors and calipers and clears room to run 15" wheels and slicks for drag racing applications. We all know less rotating mass is the best way to free up power! This kit will save about 15 pounds of rotating mass overall.

Vehicle Fitment:
2015-2021 Subaru WRX Rear
2005-2021 Subaru STi Rear
• Fits 5x114.3

(Does NOT fit 2002-2014 WRX)
(Does NOT fit 2022 WRX)
(Does NOT fit 2004 STi)

More Info:
The STM brake kits include Wilwood calipers and your choice of standard rotor or the ultra lightweight scalloped rotor, custom STM aluminum mounting brackets, black anodized rotor hats, STM brake lines and all mounting hardware. The rotors will ship pre-assembled to the hats with safety wire as pictured.

The scalloped rotor is 1.15 pounds lighter than the standard rotor and is recommended for cars that see more miles on the drag strip than on the street. The scalloped rotor is not a street rotor.

Installed pics coming soon!

• This brake set-up is specifically designed for drag racing
• This is not intended for constant, on/off braking as in road-racing or autocross
• Will clear most 15" wheels

STM Weights:
STM Front Scalloped Kit (per side): 9.00 pounds
STM Front Standard Kit (per side): 10.15 pounds
Rear Scalloped Rotor: 5.60 pounds
Rear Standard Rotor: 6.75 pounds
Rear Caliper: 3.20 pounds

2015 WRX Stock Weights:
Stock Rear Kit: TBA
Rear Rotor: 9.5 pounds
Rear Caliper: 6.8 pounds

STM Rear Brake Kit Contents:
(2) STM Rotor Hats (STM-00-SUBI-FBH)
(2) STM Caliper Brackets (STM-15+WRX-R)
(1) STM Brake Lines (STM-02PLUS-WRX-RCL)
(2) Wilwood Rear Rotors (Standard 160-3202 or Scalloped 160-9772)
(2) Wilwood Rear Calipers (WIL-120-9688)
(2) Wilwood Street Brake Pads (150-9764K)
(2) Wilwood Hat Bolts (WIL-230-0150)
(4) M10x30 Bolts (FAS-1139619)
(4) M10 Washers (FAS-1140384)

IMPORTANT NOTES - For Drag Racing Only!
These brakes are designed for OFF ROAD USE ONLY and drag racing applications. They are NOT intended for consecutive, hard braking. These are not for road racing or autocross or daily street use. While these are also the same brakes we run on our STM 8 second cars, as with anything performance-oriented, please be sure to check and double-check every aspect for safety! Please use your discretion and drive safely.
See more STM Parts
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  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved
STM Lightweight Rear Drag Brake Kit for 15-21 WRX/05-21 STi

$1,140.00

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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