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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 [mazda b2200 headers](https://cnrautoparts.com/90-93-mazda-b2000-06-17-toyota-rav4-2-2l-2-5l-exhaust-manifold-header.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. |