2007.5-2018 Cummins 6.7L 4th Gen Steed Speed T4i VGT Exhaust Manifold (steedT4i67)The Steed Speed T4i Exhaust Manifold is the finest manifold on the planet for the 6. 7L Cummins. Hands Down, it will outperform any other manifold available for your Cummins. The T4i Manifold isn't some cheap cast or weak tubular manifold, it's fully CNC machined from solid billet to ensure it will outlast all other components on your truck. It's a perfect fit for your stock VGT turbo, intake, and downpipe and requires no other modifications for