OEM GT3-style lower control arms for most 1997-present 911/Cayman/Boxster/718

OEM GT3 Adjustable Lower Control Arm Set

Front or rear for most 1997-present 911, Cayman,Boxster, and 718 models.

Note: these are sold as a left+right pair (price shown is for TWO arms) and are supplied complete with all ancillary parts - $1100 value elsewhere. Get all parts shown at one price.

Kits are sold as a pair suitable for front or rear. Buy 2 kits to do the complete car.

Derived from Porsche GT3 suspension architecture, these adjustable lower control arms provide expanded front axle camber capability while retaining OEM design integrity, durability, and ride compliance.

The two-piece shim-adjustable arm design allows precise camber tuning for track or performance street applications while improving front-end grip, steering precision, and tire contact control under load. Additional negative camber is built into the arm geometry before shim adjustment, with further correction of ±2 degrees available through the included shim packs.

Forged aluminum arm bodies combine low unsprung mass with high structural rigidity, while OEM-style elastomer bushings preserve isolation and service life appropriate for road and dual-purpose use.

Kit Includes

• Left and right OEM GT3-type lower control arms (one complete pair)
  
• Inner bushing sections
  
• Complete camber shim sets (1mm, 1.5mm, 3mm, 7mm) for each arm (8 shims total)
  
• Litronic headlamp correction brackets
  
• Thrust arm spacers for applicable chassis
  
• Caster-adjustable thrust arm bushings
  
• Installation hardware (4X double-ended studs, 8mm spacers, locking nuts)
  

NO EXTRA PARTS TO BUY - all required ancillary components are included.

Technical Features

Replaces these OEM part numbers:

• 996-341-121-90

• 996-341-122-90

• 996-341-441-90

GT3 Shim Adjustment System

Allows repeatable camber adjustment through calibrated shim changes rather than eccentric-only adjustment.

Increased Static Negative Camber

Provides additional front or rear axle camber relative to standard non-GT control arms, improving turn-in and outer shoulder support under cornering load.

Forged OEM Construction

High-strength forged aluminum construction designed for motorsport-derived loading while maintaining factory serviceability. 

Geometry Correction for Lowered Cars

Particularly beneficial where ride height changes have reduced available alignment range.

OEM Ride and NVH Characteristics

Retains compliant bushing behavior absent the noise, harshness, and maintenance associated with spherical-bearing race arms.

Applications

Fits many models including:

• 996 Carrera / Turbo
  
• 986 Boxster
  
• 997 Carrera / C4 / Turbo
  
• 987 Cayman and Boxster
  
• 981 Cayman and Boxster
  
• 991 front applications
  
• 718 (982)
  

Verify application-specific spacer and bracket requirements before installation.

Notes

• Alignment required after installation.
  
• Recommended for performance street, DE, autocross, and track use.
  
• Litronic brackets included only to be used for vehicles equipped with factory headlamp leveling systems.
  
• Thrust arm spacers included where required, rather than offered as separate add-ons - not necessary to use in all applications.
  
• A factory-style solution for increased alignment range without moving to full race control arm assemblies.