Cobb 15-21 Subaru WRX/STI Adjustable Toe Arm & Adjustable Lower Control Arm Package - CB-0015

The COBB Adjustable Toe Arm & Adjustable Lower Control Arm Package (CB-0015) is a purpose-built rear suspension alignment solution for the 2015–2021 Subaru WRX and STI. When you lower your WRX or STI, the factory fixed-length rear arms can no longer bring the rear suspension geometry back into proper alignment — this package exists specifically to solve that problem. Combining two critical adjustable rear suspension components in one kit, it gives you the tools to dial in correct toe and rear lower control arm positioning after ride height changes.

Key Features & Benefits

• Two-component alignment package: Includes both an adjustable toe arm and an adjustable lower control arm — the two rear suspension links most directly affected when a WRX or STI is lowered — so you can address rear alignment comprehensively rather than piecemeal.
• Designed for lowered applications: The factory rear geometry is engineered around stock ride height. Once the car is lowered, the fixed OEM arms can pull toe and geometry out of spec. These adjustable arms restore your ability to set alignment correctly, which directly affects tire wear, handling balance, and straight-line stability.
• Restores proper rear toe adjustment: The adjustable toe arm allows an alignment technician to bring rear toe back within spec (or to a performance alignment target) that the factory arm simply cannot achieve at reduced ride height.
• Restores proper lower control arm geometry: The adjustable lower control arm addresses rear lower suspension geometry that shifts when ride height drops, complementing the toe arm correction for a complete rear alignment solution.
• COBB engineering: Engineered by COBB Tuning, a brand with a long track record in Subaru performance, this package is built specifically for the 2015–2021 VA-chassis WRX and STI platform.
• Sold as a package: Buying the toe arm and lower control arm together as CB-0015 streamlines procurement and ensures the two components are matched for this specific application.

Specifications

• Part Number: CB-0015
• Brand: COBB Tuning
• UPC: 700424681020
• Application: 2015–2021 Subaru WRX / WRX STI (rear suspension)
• Package Contents: Adjustable Toe Arm + Adjustable Lower Control Arm (see What's in the Box below)

Fitment

This package fits the following vehicles:

• 2015–2021 Subaru WRX — Base, Premium, and Limited trims
• 2015–2021 Subaru WRX STI

This package is designed for the VA-generation WRX/STI platform. If you are unsure whether CB-0015 fits your specific build or trim level, contact the ThreePiece.us fitment team before ordering — we're happy to verify compatibility.

What's in the Box

• 1x COBB Adjustable Rear Toe Arm
• 1x COBB Adjustable Rear Lower Control Arm

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimum required for this product.
• Affirm Financing: Split your purchase into manageable payments with Affirm financing available at checkout.
• Expert Fitment Support: Our team has served 10,000+ customers and specializes in suspension fitment. Call us at 813-535-5801 or email [email protected] with your year, trim, and current ride height setup and we'll make sure CB-0015 is right for your build.
• In Stock: CB-0015 is a regularly stocked product — no extended lead times on this item.
• Price Match Guarantee: Found it for less elsewhere? We'll match it.

Frequently Asked Questions

Q: Why do I need adjustable toe arms and lower control arms after lowering my WRX or STI?
A: The factory rear suspension arms are fixed-length and calibrated for the OEM ride height. When you lower the car — whether with coilovers or lowering springs — the geometry of the rear suspension shifts. This causes toe and lower arm angles to move outside of what the factory alignment procedure can correct, leading to accelerated tire wear, unpredictable handling, and an alignment that drifts out of spec. COBB's CB-0015 package replaces those fixed arms with adjustable units so your alignment shop can properly set rear toe and lower arm geometry regardless of your ride height.

Q: Does this package fit both the WRX and the WRX STI?
A: Yes. CB-0015 is confirmed to fit 2015–2021 Subaru WRX (Base, Premium, Limited) and the 2015–2021 Subaru WRX STI.

Q: What exactly comes in the CB-0015 package?
A: The package includes two components: one adjustable rear toe arm and one adjustable rear lower control arm. These are the two rear suspension links most critical for restoring proper alignment geometry on a lowered WRX or STI.

Q: Will I need a professional alignment after installing this kit?
A: Yes. These arms are adjustable precisely so that a professional alignment technician can set your rear toe and lower arm geometry to the correct specification after installation. Installing adjustable arms and skipping an alignment would defeat the purpose of the upgrade. Plan to schedule a four-wheel alignment immediately after installation.