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1. The factory exhaust manifolds on the Nissan Titan have a catalytic converter built right into them. This arrangement is very restrictive, so Stillen designed their replacement long-tube Titan headers to eliminate the factory cats, therefore freeing up horsepower. In doing so, Stillen was able to achieve gains between 25 to 30 rear-wheel horsepower. Stillen currently offers these stainless-steel parts for Titans and Armadas in a polished or ceramic-coated finish. Note: These headers are not approved for emissions-control vehicles.