Steeda S550 Mustang 'Ultimate' IRS "Stop The Hop" Pack - Mach 1 / GT350

Our IRS 'Stop the Hop' Package addresses wheel hop issues notorious with the S550 chassis 2015-2023 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. Even though the Mustang Mach 1 and Shelby GT350 do offer an improved subframe setup from the factory, make no mistake, our Steeda setup will markedly improve your package!

This "Ultimate" Stop the Hop pack is aimed for forced induction/ Supercharged cars or for drag strip focussed cars, when putting power down is the main aim! Our "street" pack is perfect for road cars or track day cars. 

Our Steeda Vertical Links are far superior to the stock vertical links on your S550 Mustang. They feature billet steel bushing sleeves and spacers, providing less deflection than the rubber bushings in the stock links, without increasing NVH. The strength of the billet that the Steeda Vertical Links are made of will provide a more solid feel to your suspension and will not flex under load. The street pack version is the polybush equipped vertical links rather than the Delrin equipped links from the "Ultimate" stop the hop pack, which is more suited to supercharged or drag focussed cars.

Our Steeda Mustang IRS Subframe Support Braces tie this Handling package together. These quality 4120 chrome moly steel braces are engineered to connect 3 very important points on the S550 chassis. The result of this solid connection is added rigidity that lacks in the rear of the 2015-2023 Mustang. By stiffening the connections of the rear of the chassis, this one component is able to limit IRS subframe movement, reduce wheel hop, and improve handling during cornering.

Our Steeda Adjustable Rear Toe Links improve the handling characteristics and improve your vehicle's overall handling response. These toe links have a large range of adjustability and adjustments can be made while they're installed on the car.

Package Includes:
555-4449 - 2015+ Steeda Mustang IRS Subframe Bushing Support System
555-4438 - 2015+ Steeda Mustang IRS Subframe Alignment Kit
555-4121 - 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

Product Benefits

• Improves vehicle handling
• On-car toe adjustability
• Improves suspension compliance
• Perfect for street car / track use
• Increases traction
• Aligns subframe to chassis
• Limits IRS sub frame movement
• Reduces wheel hop
• No added NVH
• Normally In Stock

Fitment:
S550 GT350  2016+
S550 Mach 1 2021+

UK Mainland are addresses not in Northern Ireland, but includes Islands, & Scottish Highlands. Delivery to "Highlands & Islands" can take longer.

SERVICES (inc VAT prices)
Royal Mail Registered (small items) UK 2-5 days £4.98
Royal Mail Registered (small items) 1-2 days £9
Parcelforce / UPS / DPD / DHL UK Mainland 1-2 days £11.40

REST OF WORLD DELIVERIES - are available.
Please contact us to arrange a shipping quote.
FOR EU - use the Steeda.eu.com site