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Also...
I would add that it depends on your location. If you have emissions testing, you probably would need to research the catted downpipe brand that're you're thinking of too...
Also, your future goals may impact this choice... I went catless for my pending turbo upgrade. I want the best possible flow for the increase cfm of the new turbo. My goal is pushing the stock long block to the max.
Our engines are nothing more than a high-powered air pumps. Anything impeding the flow of air through it from start to finish will cause a power loss. Significant loss? Depends on a few factors but for day-to-day driving, you'd probably be ok with catted.
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