SPL Parts SPL TR 991 Front Caster Arms for 2012-2026 Porsche 911/Cayman

Vehicle Fitment

• 2012-2019 Porsche 911 Carrera (991, 3.4L/3.8L H6, RWD)
• 2012-2019 Porsche 911 Carrera S (991, 3.8L H6, RWD)
• 2012-2019 Porsche 911 Carrera 4 & 4S (991, 3.4L/3.8L H6, AWD)
• 2012-2019 Porsche 911 GTS (991, 3.8L H6, RWD/AWD)
• 2012-2019 Porsche 911 Turbo & Turbo S (991, 3.8L Twin-Turbo H6, AWD)
• 2012-2016 Porsche Boxster & Boxster S (981, 2.7L/3.4L H6, RWD)
• 2012-2016 Porsche Cayman & Cayman S (981, 2.7L/3.4L H6, RWD)
• 2017-2026 Porsche 718 Boxster (982, 2.0L/2.5L/4.0L H4/H6, RWD)
• 2017-2026 Porsche 718 Cayman (982, 2.0L/2.5L/4.0L H4/H6, RWD)

Fitment Notes

• Fits standard 991, 981, and 982 suspension configurations.
• Does not fit 991 GT3, GT3 RS, GT2 RS, or Cayman GT4/718 GT4 models.
• Provides adjustable front caster and anti-dive geometry.
• Professional alignment is required after installation.

Features

• Wide range of front caster adjustment for optimized steering response.
• Adjustable anti-dive geometry using precision aluminum spacers.
• Double-adjuster design allows on-car alignment changes.
• PTFE-lined FK spherical bearings eliminate rubber bushing deflection.
• CNC-machined 6061-T6 billet aluminum construction.
• Electroless nickel-plated 4140 chromoly steel adjuster for strength and corrosion resistance.
• Improves braking stability, turn-in response, and front-end feedback.
• Designed and manufactured in the USA for motorsport and high-performance street use.

Specifications

• Position: Front
• Product Type: Adjustable Front Caster (Tension/Thrust) Arms
• Material: CNC-Machined 6061-T6 Billet Aluminum
• Adjuster Material: 4140 Chromoly Steel
• Bearing Type: PTFE-Lined FK Spherical Bearings
• Adjustment: On-car double-adjuster caster adjustment with anti-dive spacers
• Finish: Black Anodized Aluminum

Included Components

• 2x Adjustable front caster arms
• 2x Double adjusters
• 4x PTFE-lined FK spherical bearings
• 1x Anti-dive spacer kit
• 1x Installation hardware kit

Product Description

The SPL Parts SPL TR 991 Adjustable Front Caster Arms are engineered for Porsche 991, 981 Boxster/Cayman, and 982 (718) models to provide precise caster adjustment while improving steering precision and braking stability. By replacing the compliant factory rubber bushings with premium PTFE-lined FK spherical bearings, these arms eliminate unwanted deflection and deliver more direct suspension response during aggressive driving.

Featuring lightweight CNC-machined 6061-T6 billet aluminum construction, a high-strength 4140 chromoly double adjuster, and adjustable anti-dive geometry through precision spacers, the SPL TR 991 allows accurate alignment tuning without removing the arms from the vehicle. The result is sharper turn-in, improved front-end grip, enhanced alignment consistency, and increased confidence for street, autocross, and track applications while maintaining exceptional durability.