Cummins Non-EGR ISX CHROME Exhaust Manifold

If you’re looking to improve the performance of your 1999–2002 Non-EGR Cummins ISX, the PDI Big Boss Exhaust Manifold is designed to deliver better airflow, cooler exhaust temperatures, and improved turbo response.

This manifold is engineered to maximize exhaust airflow, helping reduce turbo lag and allowing the turbocharger to spool more efficiently. Each runner has been carefully designed and tested to provide balanced airflow to the turbo, improving overall engine efficiency.

Compared to a factory manifold, the PDI Big Boss design increases airflow by an average of 20%, while helping reduce exhaust gas temperatures by 75–100°F. Improved exhaust flow also helps maintain a better exhaust pressure to boost pressure ratio, which can contribute to improved performance and potential fuel economy gains.

PDI manufactures these manifolds using High Silicon with Molybdenum Ductile Iron (HSMD), a premium material built to withstand extreme heat cycles. This high-strength material helps eliminate common failures such as warping, cracking, and center divider erosion that can occur with stock manifolds over time.

Available For

1999–2002 Cummins ISX Non-EGR Engines

Key Benefits

• 20% increase in airflow over stock manifolds

• 75–100°F reduction in exhaust gas temperatures

• Helps reduce turbo lag and improve turbo response

• Supports improved boost efficiency and potential fuel economy gains

• Made in the USA

Premium Construction

• Built from High Silicon Molybdenum Ductile Iron (HSMD)

• Designed to resist warping, cracking, and heat erosion

• Reinforced mounting surfaces for improved durability

Required Component

• Turbo – Part #715500

Warranty

3 Year Unlimited Mileage Warranty

⚠️ Important Notice:
Not legal for sale or use in California.

At Redneck Diesel Performance, we carry parts that help your truck run cooler, spool faster, and stay reliable mile after mile. And if you’d rather have it done professionally, we can install the manifold for you at our shop as well.

For more information or help with your setup, call us at 972-921-4316.