This Ferrea Valve Spring Kit upgrades the valvetrain on the Toyota Supra 3.0L B58 turbo (and BMW B58) inline-six with springs designed for improved valve control over stock at elevated boost and rpm. Sold as a complete kit.
| Brand | Ferrea |
| Type | Valve spring kit |
| Application | Toyota Supra 3.0L / BMW B58 turbo |
| Part Number | KT4048 |
| Use | Boost / high-rpm valvetrain upgrade |
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