Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster-COBB-COBBCB-ALY0017K
Click to zoom in

Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster

COBB
COBBCB-ALY0017K
700424680955
Control Arms
13 Units In Stock - Ships Next Business Day
$ 1,025.00
$ 1,025.00

SKU: BCB-ALY0017K   |   UPC: 700424680955

Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster

The Cobb Alloy Front Lower Control Arm with offset caster fits 2015-2021 Subaru WRX, STI and 2018 STI Type RA models. This complete assembly replaces factory steel arms with lightweight aluminum for sharper steering and better alignment under load. Gain 1.5 degrees of additional caster to enhance straight-line stability and cornering grip.

Key Features

  • Billet 6061-T6 Aluminum: Cuts unsprung weight by over 40% versus OEM steel arms for quicker suspension response and improved ride quality.
  • 1.5° Caster Offset: Boosts dynamic caster for consistent camber control during hard cornering and high-speed stability.
  • Complete Assembly: Includes Moog ball joints, Energy Suspension HyperSTREET II polyurethane bushings and all hardware for direct bolt-on replacement.
  • Enhanced Geometry: Maintains optimal suspension kinematics on lowered or modified vehicles without alignment compromises.
  • Anodized Finish: Resists corrosion and wear for long-term durability in harsh driving conditions.

Product Notes

  • Wheel alignment required after installation to dial in caster gains.
  • Compatible with OEM or aftermarket sway bars and coilovers.
  • Ships as single arm; order pair for both sides.

Installation Notes

  • Professional installation recommended.
  • Bolt-on using factory mounting points; no cutting or welding needed.
  • Torque bushings and ball joint to Subaru service manual specs.

This Part Fits

Year Make Model Submodel
2015-2021 Subaru Impreza WRX
2015-2021 Subaru WRX STI
2018 Subaru WRX STI Type RA

Why Choose Cobb?

  • Decades of Subaru-specific engineering from street to rally stages.
  • Track-proven components tested on VA-chassis WRX and STI platforms.
  • Precision CNC-machined in the USA for exact fit and function.

Frequently Asked Questions

  • Q: Will this fit my 2017 WRX with coilovers?
    A: Yes, designed for 2015-2021 WRX, STI and 2018 Type RA; works with stock or lowered setups up to 2 inches drop.
  • Q: What bushings and ball joints are used?
    A: Equipped with Energy Suspension HyperSTREET II durometer-matched polyurethane bushings and heavy-duty Moog ball joints for smooth operation.
  • Q: What is the warranty coverage?
    A: Backed by Cobb's 2-year limited warranty against manufacturing defects when installed properly.

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Protective foam-lined box, 17" x 11" x 5"
  • Weight: 6.1 lbs

Request For Information

Have questions about Cobb 15-21 Subaru WRX & STI/2018 Type RA Alloy Front Lower Control Arm (Complete) Offset Caster? Fill out the form below and we'll get back to you by the next business day.
Alignment Components

Alignment Components

Alignment components at Black Ops Auto Works include camber kits, caster kits, adjustable control arms, toe links, and shock mounts and camber plates built to correct suspension geometry and reduce uneven tire wear. Shop billet control arms, cam bolt kits, and adjustable arms from SPC Performance, AAD, Fox, and more. Black Ops Auto Works carries 1,367 alignment component SKUs across street, off-road, and towing platforms including Jeep, Dodge, GM trucks, Honda and Acura, and Toyota and Lexus. What This Collection Covers This collection combines five related alignment and suspension geometry categories: alignment kits, caster kits, control arms, camber kits, and shock mounts and camber plates. Product Types in This Collection Shoppers will find cam bolt and cam bracket kits for camber and caster correction, adjustable billet upper and lower control arms, rear toe links, and strut mounts. Camber and Caster Correction Camber kits and caster kits use cam bolts or adjustable bushing...

View Alignment Components Products
COBB

COBB

COBB Tuning parts for turbocharged performance platforms are stocked at Black Ops Auto Works. Shop the Accessport ECU programmer, cold air intakes, cat back exhaust systems, and supporting hardware engineered for Subaru WRX and STI, Ford Focus ST and RS, Ford F-150 EcoBoost, Mazdaspeed3 and 6, Nissan GT-R, Porsche, BMW, and Volkswagen platforms. Every product is filterable by year, make, model, and trim so the correct part ships the first time. Black Ops Auto Works carries 372 COBB SKUs across tuning, intake, and exhaust categories. What This Brand Covers COBB Tuning built its reputation on the Accessport, one of the most widely used ECU flash tools in the aftermarket, and has expanded into intakes, exhausts, downpipes, and supporting hardware for a range of turbocharged platforms. The catalog centers on a defined group of import and Euro performance vehicles rather than a single brand family. Brand Focus COBB Tuning parts are engineered primarily for Subaru, Ford, Mazda, Nissan...

View COBB Products
Control Arms

Control Arms

Control arms for lifted trucks, SRT and Hellcat platforms, and off-road builds are stocked at Black Ops Auto Works. Shop tubular steel upper control arms, billet adjustable control arms, rear toe links, camber arm kits, and vehicle-specific control arm sets for Jeep Grand Cherokee and Trackhawk, Dodge Durango, Charger, Challenger, 300, and Magnum, Toyota 4Runner and FJ Cruiser, Lexus GX460 and GX470, Ford Mustang, and GM 1500 trucks. Every product is filterable by year, make, model, trim, and lift height so the correct control arm ships the first time. Black Ops Auto Works carries 789 control arm SKUs across upper, lower, adjustable, and toe link categories. What This Collection Covers Control arms connect the wheel hub and knuckle assembly to the vehicle frame and control wheel travel through compression and droop. Worn OEM control arms with loose ball joints or deteriorated bushings cause vague steering, uneven tire wear, and handling inconsistency. This collection covers arm ...

View Control Arms Products
Suspension

Suspension

Suspension parts and complete kits for cars, trucks, SUVs, Jeeps, and off-road builds are stocked at Black Ops Auto Works. Shop coilovers, lowering springs, lift kits, leveling kits, shocks and struts, sway bars, control arms, tie rods, ball joints, bushings, chassis bracing, alignment hardware, air suspension, and complete stage kits from Bilstein, KW, Ohlins, Fox, KING, ICON, BC Racing, Silvers, Eibach, H&R, Swift Springs, Whiteline, Energy Suspension, Moog, SPC Performance, Rough Country, ReadyLIFT, BDS, Skyjacker, Air Lift, Firestone, and Black Ops Auto Works. Start with a matched shock and spring package or a full coilover kit, then layer in sway bars, chassis bracing, and camber adjustment hardware. Every part is filterable by year, make, model, trim, and drivetrain to confirm fitment before ordering. What This Category Covers Suspension is the highest-leverage handling upgrade on any vehicle. A properly matched shock, spring, and sway bar package produces measurable i...

View Suspension Products
Military & First Responder Discounts

Military & First Responder Discount Program

Black Ops Auto Works proudly honors active duty military, veterans, National Guard, reserves, police officers, firefighters, and EMTs with an exclusive 5% discount on all performance parts and carbon fiber upgrades. Verify instantly and start saving today.

Learn More & Apply

Your cart

×