Supertech Valve Springs - - BMW M3 BASE S14 L4 ; - SPR-H1000D-S Supertech Valve Springs are made with premium Superclean Chrome Silicon Vanadium Steel Alloy for higher performance and durability at high RPM ranges. The Supertech materials also provide for better memory, which translates into higher performance. Computer designed to ensure that wire stress levels do not overpass their limits, Supertech Valve Springs are manufactured for long term durability even under the most extreme conditions. Supertech Valve Springs are sold *Per Valve Spring*. For Example, when order for a Model that requires 16 Valve Springs, order 'Quantity: 16'
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