Steeda Mustang w/ Brembo 'Stop The Hop' Ultimate Handling Kit (2024+)

Steeda's Stage 3 'Stop the Hop' handling kit stiffens and aligns the IRS subframe on Brembo-equipped S650 Mustangs. Subframe deflection is the root cause of wheel hop on these cars, and this package fixes it while also sharpening corner-exit traction and giving you on-car toe adjustment.

Subframe stiffened and squared

The IRS subframe bushing support system fills the voids in the factory mounts so the subframe can't bounce, and the alignment kit squares it to the chassis for straighter launches. The 4120 chromoly support braces tie three chassis points together to limit subframe movement in corners.

Firmer links, no extra noise

Billet vertical links replace the rubber factory bushings with steel sleeves and spacers to cut deflection without adding noise or vibration. Adjustable rear toe links offer a wide range and can be set while installed on the car.

What's included

• IRS Subframe Bushing Support System (555-4437)
• IRS Subframe Alignment Kit (555-4438)
• Billet Aluminum Vertical Links
• IRS Subframe Support Braces (555-5754)
• Adjustable Rear Toe Links (555-4120)

Highlights

• Reduces wheel hop
• Better traction and corner exit
• Limits IRS subframe movement
• Subframe-to-chassis alignment
• On-car toe adjustment
• No added NVH
• Moderate install, about 3 hours

Note: The subframe support braces don't fit convertibles or 2024+ Mustangs with base brakes. For even less toe change under hard launches, add the S650 Rear Lower Control Arm Spherical Bearings (555-4141).

Fitment: 2024-2026 Mustang GT, EcoBoost and Dark Horse with Brembo brakes (coupe). Steeda part #555-2129-H-7GPP.