• 20% increase in airflow over stock
• 75-100 degree cooling of EGTs
• Made in the USA

  Warranty: 3 Year Unlimited Mile Warranty

PDI has designed their exhaust manifolds to maximize the exhaust air flow to reduce turbo lag time and cool exhaust temperatures. In the design of the manifold, each port is analyzed and tested to provide a balanced flow to the turbocharger. Big Boss Exhaust Manifolds produce, on average, a 20% airflow increase over a stock manifold, cooling exhaust temperatures by 75-100 degrees. PDI manifolds are a big part in maintaining the best exhaust pressure to boost pressure ratios which will provide the potential for increased fuel economy.

At PDI, they use only the best material for their products. PDI uses a superior grade of High Silicon with Molybdenum Ductile Iron (HSMD) that eliminates weak points such as warping, cracking, and center divider failure from heat erosion. This material, combined with a redesign of the mounting surfaces, eliminates common failures due to a fatigued manifold.

**Requires Cummins Stage 1 Turbo***

NOT LEGAL FOR SALE OR USE IN CALIFORNIA