Big Boss CAT E-Model Exhaust ManifoldAvailable for: Caterpillar 1994 2004 3406E, C15, C16 Engines CAT Manifold CARB EO# D773 2 Big Boss CAT E Model Exhaust Manifold Key Benefits 20% increase in airflow over stock 75 100 degree cooling of EGTs Made in the USA Warranty: 3 Year Unlimited Mile Warranty Introducing Big Boss CAT E Model Exhaust Manifold by PDI. We have designed our exhaust manifolds to maximize the exhaust air flow to reduce turbo lag time and cool exhaust temperatures. In the