PDI Big Boss 12.7 Series 60 Non-EGR Exhaust ManifoldAvailable for: 1994 2003 Detroit Series 60 12. 7L and 14L Engines Manifold CARB EO# D773 2 Key Benefits 20% increase in airflow over stock 75 100 degree cooling of EGTs Made in the USA Warranty: 2 Year Unlimited Mile Warranty The Series 60 Non EGR Exhaust Manifold has been designed to maximize the exhaust air flow to reduce turbo lag time and reduce exhaust temperatures. Stock and other manufacturers fall short as their design constricts the airflow