What is the main benefit of the monotube design in these shocks?

The monotube design allows for a larger piston and more oil capacity compared to traditional twin-tube shocks. This helps dissipate heat more effectively, leading to more consistent damping performance and preventing fade during spirited driving or track use.

Do these shocks come with everything needed for installation?

This listing is for the rear shock absorber only. It is designed as a direct replacement for the factory rear shock on compatible vehicles. It's recommended to consult the manufacturer's installation guide for a complete list of required hardware and tools.

Can I use these shocks with stock height springs?

While these shocks are optimized for use with lowering springs, they can potentially be used with stock springs. However, their tuning is specifically intended to complement the altered geometry and spring rates of a lowered vehicle for the best performance outcome.

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Specifications

Brand: Bilstein
Part #: 24-249508
UPC: 651860769592

Bilstein B8 2015-2017 Subaru WRX - STI Rear Monotube Shock Absorber

Name: Bilstein B8 2015-2017 Subaru WRX - STI Rear Monotube Shock Absorber
Brand: Bilstein
SKU: bilstein-bilstein-b8-2015-2017-subaru-wrx-sti-rear-monotube-shock-absorber-t14-95889
Price: 170.73 USD
Availability: BackOrder

$170.73

On Backorder — Expected to ship by May 21, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2015-2021 Subaru WRX/STI. Bilstein B8 rear monotube shock absorber, designed for use with lowering springs to improve handling.

Key Features

Fits 2015-2021 Subaru WRX and WRX STI.
Monotube design for consistent damping performance.
Specifically valved for use with lowering springs.
Enhances safety and performance when paired with lowering springs.
Provides a sportier feel while maintaining comfort.
Vehicle-specific tuning for improved handling.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

The Bilstein B8 Performance Plus rear shock absorber uses a monotube design, which helps it maintain consistent damping performance even under hard use. This shock is specifically tuned for vehicles already equipped with lowering springs, or for those looking to pair it with a set. It's built to work with your existing sport suspension or aftermarket lowering springs to give you a sportier feel without sacrificing too much comfort.

When you lower a car, the suspension geometry changes, and the stock shocks might not be the best match anymore. The B8 Performance Plus shocks are valved specifically for these situations, aiming to bring out the best handling characteristics of your WRX or WRX STI. Bilstein tests these dampers rigorously to ensure they meet or exceed original equipment standards, offering a solid upgrade for improved road feel and control.

If you're looking to get the most out of your lowered Subaru WRX or WRX STI, these shocks are a popular choice. They are designed to be a direct fit for the specified models and years, making installation straightforward when you're already working on suspension upgrades.