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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 [nissan titan headers](https://cnrautoparts.com/exhaust-manifold-headers-for-04-08-nissan-titan-5-6l-5-6-v8.html) 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. |