Bilstein 24-249508 B8 Performance Plus Rear Shock for 15-21 Subaru WRX/STI

Vehicle Fitment

• 2015-2021 Subaru WRX (Rear, 2.0L GAS, AWD)
• 2015-2021 Subaru WRX STI (Rear, 2.5L GAS, AWD)

Features

• B8 Performance Plus monotube gas-pressurized rear shock engineered for sportier handling
• Optimized valving designed for use with aftermarket lowering springs
• Enhanced road feel, stability, and responsiveness
• Direct replacement - installs into OE rear shock mounts without modification
• Yellow corrosion-resistant finish for long service life
• Improved traction and cornering control at lowered ride heights
• Ideal for performance-oriented driving and tuned suspension setups
• Backed by Bilstein limited lifetime warranty

Specifications

• Part Number: 24-249508
• Series: B8 Performance Plus
• Position: Rear (Driver or Passenger Side)
• Damping Type: Gas-pressurized monotube
• Lower Mount Type: Eye 12.4 mm
• Upper Mount Type: Stem
• Collapsed Length: 11.81 in (300 mm)
• Extended Length: 15.31 in (389 mm)
• Boot Included: No
• Spring Seat Included: Yes
• Sold Individually - 1 shock per unit

Included Components

• 1x Bilstein B8 Performance Plus Rear Shock Absorber (24-249508)

Product Description

The Bilstein 24-249508 B8 Performance Plus Rear Shock is a high-performance upgrade designed to bring out sharper handling and improved control on lowered Subaru WRX and WRX STI models. Built with Bilstein's advanced gas-pressurized monotube technology and application-specific performance valving, this rear shock helps maintain consistent damping performance even with aftermarket lowering springs installed. Its design enhances traction, stability, and overall responsiveness during spirited driving while preserving daily comfort.

Fitment is confirmed for 2015-2021 Subaru WRX and WRX STI models equipped with all-wheel drive and rear suspension. This shock is engineered to bolt directly into the factory rear mount locations without modification and supports a sportier suspension setup, particularly when paired with lowering springs. Coverage through the 2021 model year is verified; fitment beyond 2021 is unconfirmed at the time of listing.