For the Porsche 911 (991.2 generation), specifically the GTS and 4S models, these part numbers identify the high-performance dampers used with the PASM (Porsche Active Suspension Management) system.

The GTS models typically utilize a 20mm lower sport suspension compared to the standard Carrera, making these specific dampers essential for maintaining the car’s intended handling geometry and center of gravity.

1. Front Shock Absorber: 991.343.035.48

This is the electronic front strut designed for the 991.2 Carrera GTS / 4S (2017–2019).

• System: PASM (Electronic Damper Control).

• Placement: Fits both Front Left and Front Right.

• Compatibility: * Specifically tuned for the 3.0L Twin-Turbo chassis.

  • Integrated with the PDCC (Porsche Dynamic Chassis Control) if equipped.

• Service Note: On 991.2 models, front shocks are prone to leaking at the upper seal. If you see “misting” or oil on the blue or black dust bellows, replacement is required.

2. Rear Shock Absorber: 991.333.057.40

This is the corresponding rear electronic damper for the 991.2 GTS / 4S.

• System: PASM.

• Placement: Rear Left or Rear Right.

• Chassis Note: Because the GTS and 4S use the “Wide Body” chassis, the rear suspension kinematics differ from the base narrow-body Carrera. The .40 suffix denotes the specific damping rate for this wider track.

• Interchange: You may find this part cross-referenced with manufacturer code 2288981 or Bilstein-specific internal numbers, as Bilstein is the original equipment manufacturer (OEM) for Porsche PASM units.