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 mazda b2200 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.
Adding a dual exhaust to your vehicle can have a number of advantages. Functionally, two exhausts can improve engine performance and reduce emissions. Aesthetically, it has the sporty look that some people search for in a vehicle. Catalytic converters require a temperature of 400