PDI Big Boss 3406E/C15/C16 Low Mount Exhaust ManifoldAvailable for: 1994 2004 CAT 3406E, C15, C16 Engines CAT manifold CARB EO# D773 2 Key Benefits 20% increase in airflow over stock 75 100 degree cooling of EGTs Made in the USA When installing with a turbo, see our 90 degree turbo elbow kit for CAT 3406E, C15, and C16. Warranty: 3 Year Unlimited Mile Warranty We have designed our exhaust manifolds to maximize the exhaust air flow to reduce turbo lag time and cool exhaust temperatures. In the design of