✅ Vehicle Fitment
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2015–2023 Ford Mustang
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S550 chassis
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EcoBoost & GT models
(Street, canyon, autocross, and light track use)
🔧 Why the Hyper-Street II (R9-HS2-053) Converts Buyers
This isn’t a cosmetic drop kit—it’s a proper performance suspension.
Features That Actually Matter
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Mono-tube shock design (faster response, better heat control)
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32-way damping adjustment (rebound-focused tuning)
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Full-length height adjustment (no loss of shock travel)
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Matched spring rates for S550 chassis balance
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Complete front & rear coilover assemblies
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Direct bolt-on installation
👉 Translation: you tune the car to your driving style instead of living with factory compromises.
Hyper-Street II coilover suspension upgrade features mono-tube shocks with 32 clicks rebound settings and full length adjustable. Mono-tube shocks provides larger capacity for gas and oil to improve comfortable level of typical lowering vehicle.
📉 Lowering an S550 (Without Ruining Geometry)
The S550 responds best to a functional drop, not a slammed one.
Recommended ride heights:
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1.0–1.5 inches → ideal daily + spirited street setup
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1.5–2.0 inches → aggressive street/track stance (alignment required)
Go lower than that and you’ll invite reduced suspension travel, bump steer, and scraping regrets. Full-length adjustability keeps damper stroke intact—even when lowered.
Special 32 clicks of valving allows user to fine tune rebound force settings. Independent spring tension and full length adjustable allows drop without sacrifice comfort by shorten pitch distance.
🛣️ Ride Quality: 32 Clicks, Real Control
With 32 damping levels, you’re not guessing.
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Softer settings → daily comfort, rough roads tolerated
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Mid-range → balanced street performance
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Firmer settings → sharp response, reduced body roll
Compared to stock:
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Less float at speed
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Better bump control
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More confidence under braking and cornering
Firm when you want it. Civil when you need it.
- Full Steel Alloy Constructions With Aluminum Hardware
- Mono-Tube Shocks Provide Larger Capacity of Oil And Gas
- 32 Clicks of Rebound Force Adjustment
- Full Length Adjustment – Lowers The Car Without Ruining Spring Tension
- Independent Spring Tension – Custom Stiffness Without Change Ride Height
🎯 Handling Improvements You’ll Feel Immediately
Once installed and aligned:
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Sharper turn-in
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Reduced nose dive under braking
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More predictable mid-corner grip
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Overall tighter, more modern feel
No, it won’t turn your Mustang into a GT3 car.
Yes, it will finally feel composed instead of vague.
📐 Alignment (Mandatory, Not Optional)
Lowering an S550 always changes alignment.
Strongly recommended:
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Alignment at final ride height
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Adjustable camber plates
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Toe kept close to factory specs for street use
Bad alignment kills tires. Not coilovers.
🛠️ Build Quality & Ownership Value
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Corrosion-resistant finishes
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Monotube dampers for consistent performance
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Designed for long-term street use
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Excellent performance-per-dollar value
Install tip: Anti-seize the threads. Adjustable suspension that seizes later is just expensive garage décor.
👤 Who This Kit Is Perfect For
✔ Daily-driven S550 Mustangs
✔ Street & street/track crossover builds
✔ Owners who want real damping control
✔ Drivers who care about ride quality and handling
❌ Drag-only setups
❌ Extreme slammed builds
❌ “Alignment is optional” thinkers
🛒 Why Choose Rev9 Hyper-Street II Over Cheaper Kits?
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True mono-tube dampers
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Full-length height adjustment (huge win)
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Wide 32-click tuning range
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Better ride quality than bargain coilovers
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You won’t feel the need to upgrade again next year
Cheap suspension is cheap twice.
Christopher randazzo –
Muy buen producto
Luis Aleman –
Great product