PDI Big Boss Volvo D13 | Mack MP8 Exhaust Manifold

Available for: Volvo D13 and Mack MP8 2007-2021 Key Benefits High Quality HSM Material Improved Joint Seal Design Made in the USA At PDI, we use only the best material for our products. We use a superior grade of High Silicon with Molybdenum Ductile Iron (HSMD) that eliminates weak points such as warping, cracking,  and failure from heat erosion. This material, combined with a redesign of the mounting surfaces, eliminates common failures due to a fatigued manifold.