Steeda 'Stop the Hop' Street Enthusiast Kit | Mustang
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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 #555-4456

2015-2026 Ford Mustang – Steeda 'Stop the Hop' Street Enthusiast Kit

Fits These Vehicles 2015-2026 Ford Mustang Bullitt/GT/EcoBoost/V6
Price $874.95
  • 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.

Warranty
Limited Lifetime

Overview

Are you looking to cure your wheel hop but want a bit more than our ‘Stop the Hop’ Starter Kit, though you don’t want to go full blown with the ‘Stop the Hop’ Ultimate setup? Your wait is over. This is our ‘Stop the Hop’ Enthusiast Kit, giving you our new Spherical Rear Lower Control Arm Bearing in addition to our ‘Stop the Hop’ Starter kit, to improve your 60ft times even more.

Which “Stop the Hop” Kit is for you?

Eliminate Wheel Hop without sacrificing ride comfort or breaking the bank. Our Performance Experts got together and came up with the best four components for eliminating unwanted wheel hop in the S550 Mustang. A kit that gives you the fundamental foundation for ultimate traction and suspension compliance. First is our Alignment dowel kit. This fills the factory bolt hole voids with CNC machined Delrin inserts that will square up the rear subframe to the chassis. By filling these voids we are also limiting the side to side and front to back movement of the subframe that is present under hard acceleration and braking. Second is our tried and true IRS Subframe Bushing Support System. This 8 piece kit was a first of it’s kind in the performance aftermarket and so innovative and popular we patented it’s design! Made in house from billet 6061 aluminum and featuring stainless steel hardware, this kit fills all the factory voids in the IRS subframe mounting locations. It’s job is to prevent up and down movements of the subframe. Third to this kit is the strongest support brace for the S550 IRS on the market! Made in house from chromoly steel, this brace is designed to support the factory subframe by directly tying it into the chassis at key mounting locations. Using factory mounting locations on the factory frame, this 5-point brace supports the front factory mount and the lower control arm mount as well. A simple bolt in design this brace ties the subframe to the chassis in the best possible way. Fourth are our Rear Lower Control Arm Spherical Bearings. These eliminate the factory deflection that can cause up to 2 degrees of inward toe upon acceleration, and improve chassis responsiveness. If you drag race your GT, EcoBoost or V6 Mustang, our spherical bearings for the rear lower control arm will assist tires hooking immediately upon acceleration. These four parts were the first of their kind for the S550 Mustang and nothing will prevent unwanted subframe movement or wheel hop better than this kit for the price.

On the Car

Key Benefits

555-5754 – Steeda IRS Subframe Support Braces
555-4437 – Steeda IRS Subframe Bushing Support System
555-4438 – Steeda IRS Subframe Alignment Kit
555-4117 – Steeda S550 Mustang Rear Lower Control Arm Spherical Bearings
Eliminate wheel hop while not increasing NVH
Eliminate subframe movement
Squares subframe to the chassis
No permanent modifications
Eliminates alignment change under power

Video

Fitment

2015-2026 Ford Mustang Bullitt/GT/EcoBoost/V6.

Note: Steeda IRS Subframe Support Braces Will Not Fit Convertible.

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

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— 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$874.95
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OVER 35 YEARS IN FORD PERFORMANCE. RACING EVEN LONGER.
— Steeda Autosports · sold & installed by FFP
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