Steeda S650 'Stop the Hop' Enthusiast Street Kit (2024+)

The Enthusiast Street Kit is the middle step in Steeda's 'Stop the Hop' line for the S650 Mustang: everything in the Starter Kit plus rear lower control arm spherical bearings. It's aimed at drivers who launch hard and want real gains in 60-foot times without going all the way to the Ultimate kit.

Subframe locked in place

Delrin alignment dowels square the rear subframe to the chassis and stop it shifting under hard acceleration and braking. The billet aluminum bushing support system fills the factory mount voids to stop vertical movement, and the chromoly support brace ties the subframe to the chassis at factory mounting points.

No more toe-in on launch

The factory rear lower control arm bushings can let the rear wheels toe in by up to 2 degrees under acceleration. The spherical bearings eliminate that, so the car launches straighter and responds more quickly.

What's included

• IRS Subframe Support Brace (555-5754)
• IRS Subframe Bushing Support System (555-4437)
• IRS Subframe Alignment Kit (555-4438)
• S650 Rear Lower Control Arm Spherical Bearings (555-4141)

Highlights

• Reduces wheel hop without added NVH
• Limits subframe movement
• Squares the subframe to the chassis
• Alignment stays put under power
• No permanent modifications
• Moderate install, about 3 hours

Note: The subframe support brace doesn't fit convertibles. This kit doesn't fit 2015-2023 Mustangs. For even better launch control, pair it with Steeda's adjustable differential bushing inserts (sold separately).

Fitment: 2024-2026 Mustang GT, EcoBoost and Dark Horse (coupe). Steeda part #555-4456-7G.