PDI Big Boss Cummins ISX15 | X15 Exhaust Manifold

2 reviews
  • $1,750.00

Available for: Cummins ISX15 and X15 Engines 2010-2020

Key Benefits

  • Up to 20% increase in airflow over stock
  • 75-100 degree cooler EGTs
  • Made in the USA

Warranty: 3 Year Unlimited Mile Warranty

PDI Big Boss Exhaust Manifolds are designed to maximize 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% air flow increase over a stock manifold, cooling exhaust temperatures up to 75-100 degrees. PDI manifolds are a big part in maintaining the best exhaust pressure to boost pressure ratios which will provide potential for increased fuel economy.

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.


Install Video:

Customer Reviews
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Allen B.
United States United States

Exhaust manifold for X15 Cummins

Wow is all I can say! Throttle response,engine running smoother, the torque is phenomenal and I’ve seen a slight increase in fuel mileage. The exhaust manifold along with the tuner and intake manifold have given me a great running and pulling truck!!! Thanks PDI!!!!

Performance Diesel Inc PDI Big Boss Cummins ISX15 | X15 Exhaust Manifold ReviewPerformance Diesel Inc PDI Big Boss Cummins ISX15 | X15 Exhaust Manifold Review
Satveer S.
United States United States

Pdi manifold

I like it good performance