The difference is that the dual exhaust system has two exhaust systems on one vehicle. Meaning, when modifying your exhaust, never start from the front of your turbocharged vehicle with a downpipe or with headers on your naturally-aspirated platform, you will create a bottleneck in the flow. By starting with a cat-back first, your exhaust gases will flow more freely if the rest of your system is stock.
Namely, it replaces the rear axle-back and tips and then a portion of what we refer to as the mid-pipes. This system is emissions friendly and doesn’t require any tuning. In New Jersey, vehicles must pass emissions testing to ensure they meet environmental standards. Since cat-back exhaust systems do not modify the catalytic converter or engine management system, they generally do not affect a vehicle’s ability to pass emissions testing.
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.
The time and money you spend are a big investment, and we want to help you make the best decision for your driving dreams. Typically, a cat-back exhaust system will increase your car’s horsepower by somewhere between 5 and 50 brake horsepower. This will vary greatly depending on the condition of your exhaust and engine, so you should ask your mechanic if getting a cat-back exhaust is the best way to improve the performance of your car.
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