This Ferrea Dual Valve Spring Kit upgrades the valvetrain on the 2001-2006 BMW S54 (E46 M3 / Z4 M) inline-six with dual springs designed to control valve motion at high rpm and with performance camshafts. Sold as a complete kit.
| Type | Dual valve spring kit |
| Application | BMW S54 (2001-2006) |
| Use | High-rpm valvetrain upgrade |
| Part Number | KT4045 |
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