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Beehive valve spring kit MINI COOPER N14 N16 N18 1.6L Opel 1.6L 1.8L Peugeot EP6 THP150/175 16pcs Alfa Romeo 5 GDi 2020-2020All Supertech valve springs are made of Superclean premium chrome vanadium steel, which ensures higher performance and durability at high revs. The use of high quality steel alloy provides the additional advantage of better structural memory for all our springs. Our valve springs are computer designed to ensure that stress levels do not exceed the stress limits specified in the fatigue charts. Combined with our high quality steel alloy, Supertech