PDI Big Boss CAT Exhaust Manfiold for 3126 and C7 EnginesAvailable for: 1997 2007 Caterpillar 3126 and C7 Acert Engine Key Benefits 20% increase in airflow over stock 75 100 degree cooling of EGTs Made in the USA 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 the manifold each port is analyzed and tested to provide a balanced flow to the turbocharger. Big Boss Exhaust