SKU: KT4059
Ferrea 2020-2024 BMW S58 Single Spring Kit KT4059
The Ferrea KT4059 Single Spring Kit delivers reliable valvetrain control for BMW S58 engines found in M3, M4, X3 M, X4 M and M2 models. This complete kit with 24 springs and titanium retainers supports high boost and revs past 9,000 RPM without valve float. It maintains precise valve timing under extreme conditions for consistent power delivery.
Key Features
- Spring Pressure: 165 lbs seat @ 1.780 in, 440 lbs open @ 0.460 in lift with 155 lbs/in rate for stable high-RPM operation
- Coil Bind Height: 1.100 in supports cams up to 0.550 in lift preventing bottoming out
- Premium Materials: Super clean chrome silicon steel springs and 10-degree titanium retainers resist fatigue and reduce valvetrain mass
- Precision Manufacturing: Shot peened, stress relieved and dyno tested for uniform rates across all 24 springs
- Complete Coverage: 24-piece set fits inline-6 S58 valvetrain directly with no modifications
Product Notes
- Verify installed height and valve stem clearance before final assembly
- Use with OEM or aftermarket valve locks and seals for best results
- Secure storage in cool dry place to preserve spring life
Installation Notes
- Professional installation recommended.
- Measure spring installed heights and check retainer to guide clearance
- Compatible with stock BMW heads and Ferrea valves
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2024 | BMW | X3 M | All |
| 2020-2024 | BMW | X4 M | All |
| 2021-2024 | BMW | M3 | Sedan, Competition, xDrive |
| 2021-2024 | BMW | M4 | Coupe, Convertible, Competition, xDrive |
| 2023-2024 | BMW | M2 | Coupe |
Why Choose Ferrea?
- 50+ years supplying valvetrain parts to professional racing teams worldwide
- Springs dyno tested to exceed OEM durability in boosted applications
- CNC machined retainers ensure perfect fit and balance in every kit
Frequently Asked Questions
- Q: Will KT4059 fit my 2022 BMW M3 Competition xDrive?
A: Yes it fits all 2021-2024 M3 models with S58 engine including Competition and xDrive variants - Q: What materials are used in the springs and retainers?
A: Springs use heat-treated chrome silicon steel, retainers are lightweight titanium with 10-degree lock angles - Q: What is the warranty and install process?
A: Ferrea offers a 1-year warranty against defects, install requires spring compressor tool and lash adjustment post-install
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Original Ferrea box measures 12 x 9 x 7 inches
- Weight: 5.2 lbs shipping weight
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