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To maintain catalyst efficiency, the air–fuel ratio must stay close to stoichiometric and not remain rich or lean for too long.
2008 f350 6.4 egr delete kit One function shared with both the axle-back and the cat-back exhaust systems.
In California, it is illegal to select a catalytic converter for installation based solely on vehicle weight and engine size. The design of these systems often sees an increase in horsepower compared to the factory design of a vehicle.
Therefore, they are placed as close to the engine as possible, or one or more smaller catalytic converters (known as "pre-cats") are placed immediately after the exhaust manifold. Founded in 1988, Steeda is the leader in Ford performance products.
Shelby also gives the truck some off-road chops by installing a BDS 3.0-inch lift kit, Fox 2.5-inch internal bypass dampers, and performance rear traction bars.
Considering cat-back exhausts replace more restrictions, they typically offer increased performance and noise compared to axle-back systems; however, they’re also more complicated to install…and more expensive.
In California, it is illegal to select a catalytic converter for installation based solely on vehicle weight and engine size. The design of these systems often sees an increase in horsepower compared to the factory design of a vehicle.