The Cummins Exhaust Manifold Spacers are a practical and beneficial product made of stainless steel. Sold as a set, these spacers are designed to fit most Cummins engines, including ISX models from 2000 to 2003, non-EGR models from 2003.5 to 2007, EGR models from 2008 to 2010, and DPF and SCR models from 2011 to 2017. These spacers provide a reliable solution for improving exhaust manifold performance, ensuring durability and efficiency for your Cummins engine.