Steeda 'Stop the Hop' Street Ultimate Kit (555-2129) - 2015-2026 Mustang
Transform the rear suspension performance of your 2015-2026 Ford Mustang with the Steeda 'Stop the Hop' Street Ultimate Kit. This comprehensive IRS suspension package is engineered to eliminate wheel hop, improve traction, stiffen the independent rear suspension, and deliver sharper handling on the street and at the track. Designed for Mustang GT, EcoBoost, and V6 models, this kit combines Steeda's proven suspension components into one complete solution for maximizing rear-end stability and driver confidence.
Wheel hop is one of the most common performance issues on the S550 and S650 Mustang platforms. By reinforcing the IRS subframe, properly aligning the cradle, reducing suspension deflection, and improving toe control, the Steeda Ultimate Kit dramatically increases traction while maintaining excellent street manners. Unlike many aftermarket solutions, this package minimizes unwanted noise, vibration, and harshness (NVH), making it an ideal upgrade for daily-driven performance cars.
Kit Includes
- Steeda IRS Subframe Bushing Support System (555-4437)
- Steeda IRS Subframe Alignment Kit (555-4438)
- Steeda Billet Aluminum Vertical Links (555-4121)
- Steeda IRS Subframe Support Braces (555-5754)
- Steeda Adjustable Rear Toe Links (555-4120)
Features
- Reduces wheel hop during hard acceleration
- Increases rear tire traction
- Improves overall vehicle handling and stability
- Adjustable rear toe links allow on-car alignment adjustments
- Strengthens and stabilizes the IRS subframe
- Subframe alignment kit ensures proper cradle positioning
- Billet aluminum vertical links reduce suspension deflection
- 4120 chromoly IRS support braces increase chassis rigidity
- Maintains excellent street manners with minimal added NVH
- Designed and engineered by Steeda
Benefits
- Launches straighter with improved traction
- Reduces IRS movement under acceleration and cornering
- Improves suspension compliance and stability
- Provides more consistent rear suspension geometry
- Enhances driver confidence during spirited driving
- Excellent upgrade for street, autocross, drag racing, and track day use
Fitment Notes
- Fits 2015-2023 Mustang GT, EcoBoost, and V6.
- Fits 2024-2026 Mustang GT and EcoBoost models without Brembo brakes.
- Compatible with 2024+ non-Brembo Performance Pack vehicles.
- Does not fit Mustang Convertible models.
- Does not fit 2024+ Mustangs equipped with Brembo brakes.
- For even greater control under hard launches, Steeda recommends adding their Rear Lower Control Arm Spherical Bearings.
Fitment
- 2015 Ford Mustang EcoBoost
- 2015 Ford Mustang GT
- 2015 Ford Mustang V6
- 2016 Ford Mustang EcoBoost
- 2016 Ford Mustang GT
- 2016 Ford Mustang V6
- 2017 Ford Mustang EcoBoost
- 2017 Ford Mustang GT
- 2017 Ford Mustang V6
- 2018 Ford Mustang EcoBoost
- 2018 Ford Mustang GT
- 2019 Ford Mustang EcoBoost
- 2019 Ford Mustang GT
- 2020 Ford Mustang EcoBoost
- 2020 Ford Mustang GT
- 2021 Ford Mustang EcoBoost
- 2021 Ford Mustang GT
- 2022 Ford Mustang EcoBoost
- 2022 Ford Mustang GT
- 2023 Ford Mustang EcoBoost
- 2023 Ford Mustang GT
- 2024 Ford Mustang EcoBoost (Non-Brembo)
- 2024 Ford Mustang GT (Non-Brembo)
- 2025 Ford Mustang EcoBoost (Non-Brembo)
- 2025 Ford Mustang GT (Non-Brembo)
- 2026 Ford Mustang EcoBoost (Non-Brembo)
- 2026 Ford Mustang GT (Non-Brembo)
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