PDI Big Boss™ Intake Manifolds are one of the simplest and easiest upgrades for your ISX or X15 Cummins Engine. Improved airflow brings you increased performance and improved fuel economy! Requires no modifications to existing engine components to install in a small amount of time. Made in the USA. PDI Big Boss™ Exhaust Manifolds deliver cooler exhaust temperatures and increased engine performance. Made in the USA, they use high quality HSM material to eliminate OEM issues such as warping and heat erosion. Available for CAT, Cummins, Detroit and Paccar Engines.
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