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I can't answer your question directly, but I understand that you can make really nice (and safe for engine) power with stock downpipes. if you go turbo upgrade, I imagine that may change...but I asked the question directly and was told catless is not necessary to make the power you likely want. if you are going for top power and are ok with tuning to the point where the eninge enters a range of potential failure, dps might help you get there.
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