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.
Specifications
| Type | Valve spring kit |
| Application | Toyota Supra 3.0L / BMW B58 turbo |
| Use | Boost / high-rpm valvetrain upgrade |
| Part Number | KT4048 |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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