These Ferrea Dual Valve Springs upgrade the valvetrain on the BMW S54 (E46 M3 / Z4 M) inline-six with inner and outer springs for improved valve control at high rpm and with performance camshafts. Sold as a set of 24.
| Type | Dual valve springs |
| Application | BMW S54 |
| Quantity | Set of 24 |
| Note | Requires spring seat locator FERSL1141 |
| Part Number | S10156 |
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