Dorman 674-858XD Passenger Side Exhaust Manifold for Specific Models

Premium replacement - this exhaust manifold features a specialized ceramic coating designed to improve durability and performance on select vehicles Reduces future failures - by evenly distributing heat, coating reduces uneven hot and cold spots that lead to cracks, and decreases inconsistent expanding and contracting that leads to gasket failures Optimizes performance - made to smooth the interior manifold surface and keep heat within the manifold, leading to higher exhaust velocity and optimal operation Improves appearance - coating is highly corrosion-resistant, maintaining like-new appearance for years while other cast manifolds show significant unsightly rust Vehicle model years this part fits: Chevrolet W3500 Tiltmaster: 2003, 2004, 2005, 2006, 2007 Chevrolet W4500 Tiltmaster: 2003, 2004, 2005, 2006, 2007 GMC W3500 Forward: 2004, 2005, 2006, 2007 GMC W4500 Forward: 2003, 2004, 2005, 2006, 2007 Isuzu NPR: 2003, 2004, 2005, 2006, 2007 Isuzu NPR-HD: 2003, 2004, 2005, 2006, 2007 Workhorse Custom Chassis P42: 2004, 2005 Workhorse Custom Chassis W42: 2006, 2007 Workhorse FasTrack FT1461: 2004, 2005 Workhorse FasTrack FT1801: 2004, 2005 Workhorse W16: 2006, 2007 Workhorse W18: 2006, 2007 Workhorse W42: 2006, 2007 Workhorse W62: 2006, 2007