Billet Thermostat Housing Kit W/Coolant Return for 01-05 Chevrolet/GMC Duramax LB7/LLY Kingsport Grey HSP Diesel CLOTHING Eliminates compressor surge common in

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Billet Thermostat Housing Kit W/Coolant Return for 01-05 Chevrolet/GMC Duramax LB7/LLY Kingsport Grey HSP Diesel CLOTHING Eliminates compressor surge common inHSP Billet Thermostat Housing Kit W Coolant return for 2001 2005 Chevrolet GMC Duramax LB7 LLY. You should be running the forward facing thermostat housing kit, with coolant return if you have a stock turbocharger in the valley. This coolant return has a provision to allow coolant to return from the turbocharger Many of the Chevy Duramax coolant lines are routed in a way that makes it difficult to upgrade turbochargers or other performance