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Heat trap... Also helps cut down in the valve train noise.. If, and when you update your intake manifold to the GPI rod-mod, or do the FAST 102 manifold, you will leave it off anyway.
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TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.
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