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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 [99-06 silverado headers](https://cnrautoparts.com/exhaust-manifold-headers-for-99-06-chevy-gmc-gmt800.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. |