PPE High Performance Oversized Port Exhaust Manifold Gaskets 01-16 GM 6.6L Duramax BD-1024311 While the stock air box

While the stock air box technically delivers airflow

This kit comes complete with 2 bushing for a complete installation

and most importantly

Simply thread it on

PPE High Performance Oversized Port Exhaust Manifold Gaskets 01-16 GM 6.6L Duramax BD-1024311 While the stock air boxDitch your leaking factory exhaust manifold gaskets in your 6. 6L GM Duramax and replace them with the PPE High Performance Exhaust Manifold Gaskets. These gaskets feature a multi layered 301 stainless steel construction and are designed to work with PPE High Flow Exhaust Manifolds or GM OEM manifolds. Also, these gaskets feature an oversized port size(46. 8mm x 41. 0mm) for maximum exhaust flow. Sold as a pair.