As a result, the glass pack mufflers end up producing sounds that are more aggressive and louder than the straight-through muffler. This is a little bit different from most original exhaust systems. Today we’ll focus on the cat-back exhaust systems and what makes them stand out. There are the header-back, turbo-back, axle-back and cat-back systems.

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The remaining waves produce the deepened and enriched exhaust acoustics you love. Stillen offers a variety of exhaust systems for many vehicles, both foreign and domestic. The muffler is a glass filled, large chamber design that provides the optimal amount of exhaust velocity for the engine while producing a great low rumble sound - without any annoying buzzing, “racer” sound. The high clearance fitment dramatically reduces the risk of getting hung-up on obstacles when off-roading. We’ve been helping customers with performance upgrades since 2006, and have a staff full of people who can help answer your questions. Our customer service — from our low prices to our fast shipping — has earned us a reputation with a legion of fans.

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. Because stock models try to minimise materials and maximise space, with horsepower as a lower priority.

There are subtle changes on the outside to let onlookers know that this is no ordinary F-150, such as a custom dual-intake hood, a custom front fascia and grille combo, and Shelby badging. For the interior, Shelby adds carbon-fiber trim, billet racing pedals, custom floor mats, and a serialized plaque. For lean-burn spark-ignition engines, an oxidation catalyst is used in the same manner as in a diesel engine. Emissions from lean burn spark ignition engines are very similar to emissions from a diesel compression ignition engine. Upon failure, a catalytic converter can be recycled into scrap.

When used in the context of aftermarket parts or performance upgrades, “cat-back” is used to indicate which section of the exhaust system the parts replace. Cat-back systems are available as both single- and dual-exhaust. All Thermal R&amp