Ferrea Complete Single Valve Spring Kit - Audi / 2.5T / TT-RS / RS3Actual part may differ from image above. The new Ferrea Valve Springs are processed with premium grade alloy and feature special thermal treatment. Ferrea's advanced spring design and material specs have uniform load and stress distribution even in the most extreme racing conditions. Great for high revving applications. These valvesprings and retainers will reliably allow your engine to rev high without the worry of part failure, valve float, or coil

N91-029-601 / N91 029 601 / N91029601

Features of the 3H system Include:

This high-quality wheel adapter not only improves wheel clearance but also boosts stability and handling

OPTIMISED FLOW

your DME is never aware it's running more than the factory power levels

is crafted in house

& Cam Chain (VW/Audi)

Bolt on More Horsepower

Stage 1 Clutch Kits feature an integrally molded carbon Kevlar-based

Eliminates Clunks

43Rate: 300 N/mm 1712 lbs/inchBlock Height: 38

Free flowing capability creates a system that handles exhaust with brutal efficiency realizing increased HP and torque