1.6T Ferrera Dual Valve Springs G4FJ kona This is an addon item

This is an addon item only for our customers who are ordering a EBCS or intake etc

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Octane leaning disable for boost and timing

1.6T Ferrera Dual Valve Springs G4FJ kona This is an addon itemSPECIAL ORDER SET OF 16 Made to rev safely to 10,000RPM Made in the USA Ferrera double valve springs are the highest quality available, needed for 7,000RPM or up to 10,000RPM. Harmonics or high frequency fatigue is present in all racing engines and will usually destroy the valvetrain if not controlled. Properly designed valve springs will control the dominant harmonics, provide the needed stability, and reduce valvetrain component wear. Ferrea valve