TR Roll Center Adjuster / Extended Ball Joints V2 – Subaru Impreza GC/GD/GE/GR/GV/VA & Legacy BL/BP (TR-CS2004)

Lowering a Subaru improves center of gravity—but it also drops the front roll center and increases roll couple. The TR Roll Center Adjuster uses extended‑height lower ball joints to bring the geometry back into the sweet spot so the car loads the front tires more evenly in corners. Expect crisper initial response and a front end that stays planted, especially with performance tires.
This kit focuses on roll‑center correction. For the full geometry package on a lowered car, add extended tie‑rod ends to reduce bump steer—that’s how the big “RCA kits” from Whiteline/SuperPro are configured. Either way, you’ll need a fresh alignment after install.

What’s in the box

(2) Extended lower ball joints

(2) Pins (cotter pins) + hardware, incl. the black cone under the castle nut

Clean fitment

Core fitment 

• Impreza / WRX / STI: GC/GF/GM 1992–2000 · GD/GG 2001–2006 · GE/GR 2007–2013 · GP/GJ 2012–2017 · VA 2014–2021

• Legacy/Outback: BD/BG/BK 1995–1998 · BE/BH/BT 1998–2002 · BL/BP 2003–2008 · BM/BR 2009–2014

• Forester: SF 1997–2002 · SG 2003–2008 · SH 2008–2013 · SJ 2013–2018 · SK 2018–2023

• Levorg VM 2014–2020, XV/Crosstrek GP 2012–2017 / GT 2017–2022
  
  

Compatibility notes (add right under fitment):

• Alignment required

• Bump‑steer not addressed by ball joints alone—add extended tie‑rod ends for the full correction.

• Hardware tip: many shops replace the knuckle‑to‑ball‑joint pinch bolt during service—easy add‑on.

FAQ:

1. Do I need an alignment after installing these? Yes. Any ball‑joint or tie‑rod work requires a fresh alignment.

2. Do these fix bump steer? Not by themselves. Extended ball joints fix roll center. Add extended tie‑rod ends if you want bump‑steer correction like the Whiteline/SuperPro “RCA kits.”

3. Are these compatible with Anti‑Lift Kits (ALK)? Yes—ALKs relocate/control bushing geometry; they’re commonly paired with RCAs. Your page already notes ALK compatibility—keep it.

4. What’s included—do I get the black cone? Yes. The black cone under the castle nut is included.