CB-4425K Standard Bushing

CB-4428K Offset Bushing

Front Control Arm Inner Bushing

Subaru STI 2011-2021

Subaru WRX 2015-2021

Congratulations on your purchase of the COBB Tuning Roll Center Correction Kit! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.

- 1.1 CB-4425K Standard Bushing
- 1.2 CB-4428K Offset Bushing
2 Table of Contents
3 While You're There
4 Parts List
5 Tools Needed
- 5.1 Sockets
  - 5.1.1 1/2"
- 5.2 Hand Tools
- 5.3 Wrenches
6 Stock Control Arm Removal
7 Bushing Removal and Installation
8 Decide Your Needs
- 8.1 Spacer Sizing
- 8.2 OEM Style Handling
  - 8.2.1 11-14 STI
  - 8.2.2 15-21 WRX and STI
- 8.3 Anti-Dive
  - 8.3.1 11-14 STI
  - 8.3.2 15-21 WRX and STI
- 8.4 Anti-Lift
  - 8.4.1 11-14 STi
  - 8.4.2 15-21 WRX and STI
9 Installation
10 Front Suspension Torque Specs
11 Links

While You're There

While doing this installation it's an easy time to do other installations such as sway bars and endlinks. Maintenance items such as the Balljoints that can be on their way out, or potentially damaged while removing the stock arms are a good idea to have on hand, or replace at the same time as they make the whole procedure easier.

Parts List

Offset Bushing

Standard Bushing

Tools Needed

Sockets

1/2"

1/2" ratchet
1/2" 6" extension
1/2" 14mm socket
1/2" 19mm socket

Hand Tools

Needlenose pliers

Wrenches

14mm combination wrench
17mm combination wrench
19mm combination wrench

Stock Control Arm Removal

Many of these components are a common spot to collect rust, so going through and hitting them with a penetrating oil the night before you plan to do the work can make things much easier when it comes time.

Park your car in a flat, level area and allow it to cool down properly.
Jack your car up and support it properly, either using a lift, ramps, or jack and jack stands.
Lay a blanket or cardboard down under the car, or grab a creeper. In this case his name is Andrew
Remove the front wheels of the car to get easy access to the areas we'll be working on.
Moving to the front end link where it meets the control arm, use a 17mm wrench to undo the nut while using a m6 allen wrench to hold the center of the endlink and keep it from spinning. Break each side loose first (sway bar and control arm) and then remove the nut completely. Repeat with the other side.
On the bottom of the spindle straighten the cotter pin and remove it from the ball joint/castle nut.
Break the nut loose using a 19mm socket but leave it installed loosely for now.
With the nut still holding it inplace on the bottom gently tap downwards on the control arm to remove the ball joint from the spindle control arm. In some cases if it's fairly rusty (ours was). Eventually it should come free. Now is a good time to clean out any rust in this area and coat it with a thin layer of lithium grease or similar to prevent rust in the future. If it isn't coming free, tap gently upwards on the nut to push the balljoint up.
Undo the 3 19mm bolts and single 17mm bolt holding the rear control arm support bracket in place.
Remove the nut and bolt holding the front control arm bushing to the chassis using your 17mm socket and wrench.
You should be left with a bare control arm. This end is the bushing we're targeting.

Subaru Front Control Arm Front Inner Bushing