PHOSPHOR BRONZE UPGRADED VALVE GUIDES EXHAUST 7.0MM SR20 SR20DET GTIR

8 X SR20DET Exhaust - 11.03mm OD - 7mm ID. PHOSPHOR BRONZE VALVE GUIDES. Superforma chose to manufacture their valve guides from Phosphor Bronze (Cn-Sn-P Alloy) based on it's proven ability to dissipate heat and low friction properties.

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