Industrial Injection 04.5-06 Chevrolet LLY Duramax Performance Short Block ( No Heads ) LMM Replace the old thermostat housing

Replace the old thermostat housing on your 1999

This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders

This air intake system produces 14 max horsepower

This kit can be purchased with a new

Industrial Injection 04.5-06 Chevrolet LLY Duramax Performance Short Block ( No Heads ) LMM Replace the old thermostat housingIndustrial Injection 04. 5 06 Chevrolet LLY Duramax Performance Short Block ( No Heads ) Fitment: 2004 Chevrolet Silverado 2500 HD Base 2004 Chevrolet Silverado 2500 HD LS 2004 Chevrolet Silverado 2500 HD LT 2004 Chevrolet Silverado 2500 HD WT 2004 Chevrolet Silverado 3500 Base 2004 Chevrolet Silverado 3500 LS 2004 Chevrolet Silverado 3500 LT 2004 Chevrolet Silverado 3500 WT 2004 GMC Sierra 2500 HD Base 2004 GMC Sierra 2500 HD SLE 2004 GMC Sierra 2500