This Ferrea Single Valve Spring Kit upgrades the valvetrain on the 2006-2008 Audi 2.0L FSI turbo engine with single springs designed for improved valve control over stock at elevated boost and rpm. Sold as a complete kit.
| Brand | Ferrea |
| Type | Single valve spring kit |
| Application | Audi 2.0L FSI (2006-2008) |
| Part Number | KT4006 |
| Use | Boost / high-rpm valvetrain upgrade |
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