Steeda Brembo 'Stop The Hop' Ultimate Street Kit | Mustang
YOUR BUILD STARTS HERE Expert Installs Thousand Oaks, CA
805-267-9762 — Tap to Call
Authorized Dealer • Expert Installation • Thousand Oaks, CA
Discount Code: FFPERFORMANCE
805-267-9762
FFP · AUTHORIZED DEALER The leader in Ford performance · Over 35 years · MAP pricing SHOP ALL STEEDA →
AUTHORIZED DEALER
Part #555-2129-7GPP

2015-2026 Ford Mustang Dark Horse/GT/EcoBoost – Steeda Brembo 'Stop The Hop' Ultimate Street Kit

Fits These Vehicles 2015-2026 Ford Mustang Dark Horse/GT/EcoBoost
Price Original price was: $1,414.75.Current price is: $1,012.46.
  • Engineered and manufactured in Valdosta, Georgia
  • CNC-machined billet construction where applicable
  • Tested on Steeda's SCCA Majors race program
  • Steeda authorized dealer — exact MAP pricing

Limited Lifetime Warranty

Backed by Steeda — FFP is an authorized Steeda dealer and warranty claims are honored direct.

— Function Factory Performance

Authorized Steeda Autosports dealer. MAP pricing — the same price as steeda.com. Expert install available at our Thousand Oaks, CA shop. Questions on fitment or setup? Chat with Senna or call our specialists.

Overview

The full breakdown.

Install
Moderate
Time
3 Hours
Warranty
Limited Lifetime

Overview

Give your 2024+ Mustang the proven performance of Steeda manufactured suspension parts. This Steeda Mustang Ultimate IRS ‘Stop the Hop’ Package for your 2024+ Mustang GT, EcoBoost, or Dark Horse is designed to provide increased traction, stiffen the IRS subframe, reduce wheel hop, and improve overall handling characteristics.

Which “Stop the Hop” Kit is for you?

Reduces wheel hop Our IRS ‘Stop the Hop’ Package addresses wheel hop issues notorious with the S550/S650 Mustang. The Steeda IRS Subframe Bushing Support System helps with rear subframe deflection which is a direct cause of wheel hop. These bushing supports stiffen the rear subframe allowing the car to increase traction to the rear wheels. In conjunction with the bushing we also include our IRS Subframe Alignment Kit, which ensures your subframe is directly aligned to your chassis, and results in straight launches off the line.

Key Benefits

555-4437 – 2015 Steeda Mustang IRS Subframe Bushing Support System
555-4438 – 2015 Steeda Mustang IRS Subframe Alignment Kit
555-4137 – 2015 Steeda Mustang Billet Aluminum Vertical Links
555-5754 – 2015+ Steeda Mustang IRS Subframe Support Braces
555-4120 – 2015+ Steeda Mustang Adjustable Rear Toe Links
Improves vehicle handling
On-car toe adjustability
Improves suspension compliance
Increases traction
Aligns subframe to chassis
Limits IRS sub frame movement
Reduces wheel hop

Specifications

Installation Difficulty
Moderate
Estimated Install Time
(approx.) 3 Hours
Tools Required
Basic Shop Tools

Fitment

2015-2026 Ford Mustang Dark Horse/GT/EcoBoost.

Note: Steeda IRS Subframe Support Braces Will Not Fit Convertible. Will not fit 2024+ Mustang equipped with Brembo brakes.

Why Steeda
The leader in Ford performance.

Steeda has been engineering and manufacturing Ford performance parts in-house in Valdosta, Georgia for over 35 years — proven on their own SCCA Majors race team and trusted by enthusiasts who live and breathe Ford. CNC-machined billet construction, proprietary CAD-driven suspension geometry, and a relentless focus on the platforms they specialize in.

QS-9000 & ISO 9001 manufacturing · Limited lifetime warranty on Steeda-manufactured parts · Made in the USA

First-hand note

FFP fits Steeda parts every week in Thousand Oaks.

— Why we stock Steeda

OE-style engineering, in-house manufacturing, race-proven on Steeda's own SCCA program.

Steeda has been engineering Mustang — and now Explorer, Focus, F-150, and Maverick — parts in Valdosta, Georgia since 1988. CNC-machined billet, proprietary CAD-driven suspension geometry, and a factory SCCA Majors road-racing team that runs their own parts on the track every weekend. When you bolt a Steeda part onto your car, it's the same part Steeda's own race cars run.

We carry Steeda because the fitment is right the first time, the warranty is real (lifetime on Steeda-manufactured parts), and the install instructions don't leave you guessing. Drop the car at our Thousand Oaks shop and our techs handle the fit-up — or order with confidence and run it yourself.

Authority: Charles Siritho · McLaren Artura Trophy owner · Spotter for Branden Sorensen FD Pro (E46 LS+Whipple, 6th at Long Beach R1 2026) · 10+ yrs Mustang & Corvette specialist

More from Steeda

Other Steeda parts for your build.

#555-2129-H-7GPP
2015-2026 Ford Mustang Dark Horse/GT/EcoBoost – Steeda Brembo 'Stop The Hop' Ultimate Handling Kit

2015-2026 Ford Mustang Dark Horse/GT/EcoBoost – Steeda Brembo 'Stop The Hop' Ultimate Handling…

Original price was: $1,604.70.Current price is: $1,529.95.
View Product
#555-2407
2015-2023 Ford Mustang – Steeda Sport Suspension Package

2015-2023 Ford Mustang – Steeda Sport Suspension Package

Original price was: $995.94.Current price is: $969.95.
View Product
#555-2409
2015-2023 Ford Mustang – Steeda Track Suspension Package

2015-2023 Ford Mustang – Steeda Track Suspension Package

$1,619.95
View Product
#555-2127-U
2015-2023 Ford Mustang EcoBoost – Steeda Stage 1 Handling Package - Ultralite Linear

2015-2023 Ford Mustang EcoBoost – Steeda Stage 1 Handling Package - Ultralite Linear

$964.95
View Product
#555-2127
2015-2023 Ford Mustang EcoBoost – Steeda Stage 1 Handling Package - Linear

2015-2023 Ford Mustang EcoBoost – Steeda Stage 1 Handling Package - Linear

Original price was: $899.82.Current price is: $859.95.
View Product
#555-2422
2015-2023 Ford Mustang – Steeda Comfort Suspension Package

2015-2023 Ford Mustang – Steeda Comfort Suspension Package

Original price was: $1,271.94.Current price is: $1,179.95.
View Product
— FFP is an Authorized Steeda Dealer

Shop the full Steeda catalog at FFP.

The leader in Ford performance — suspension, intakes, exhaust, brakes, wheels, and more — for Mustang, Bronco, Bronco Sport, Explorer, F-150, and Maverick. Enthusiast-driven, race-tested. MAP pricing always. Expert installation in Thousand Oaks, CA.

BROWSE ALL STEEDA →
Price Original price was: $1,414.75.Current price is: $1,012.46.
ADD TO CART
OVER 35 YEARS IN FORD PERFORMANCE. RACING EVEN LONGER.
— Steeda Autosports · sold & installed by FFP
Popular Searches
Search for parts
Try "C8 exhaust" or "Mustang intake"
Navigate Enter Select Esc Close