The new heavy walled manifold by BD Diesel holds in exhaust gas temperatures to enhance turbine pumping efficiency. The runners have been ported to improve velocity in your vehicle and evacuate the cylinders. Additionally, the manifolds are coated to resist corrosion and are pre-drilled for pyrometer probes. These units replace the old rusted and leaking stock exhaust manifolds that normally require extensive cleaning and machine work to be recovered from warping and distortion. If you have any questions about Manifolds by BD Diesel for your vehicle , reach out to one of our experienced representatives. We will be happy to help you make a more informative decision.