These Ferrea Pro CNC Titanium Retainers reduce valvetrain mass on the BMW S54 (E46 M3 / Z4 M) for improved valvetrain stability and added horsepower. They use a 7-degree lock angle for Ferrea double-spring setups. Sold as a set of 12.
| Brand | Ferrea |
| Type | Pro CNC titanium retainers (double spring) |
| Application | BMW S54 |
| Lock Angle | 7° |
| Quantity | Set of 12 |
| Part Number | E11128 |
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