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Sorry I didn’t answer the core of your question.. Running catless downpipe without a tune isn’t recommended.. Always better to get a tune with it as you are altering the setup of your exhaust, and the air fuel ratio and other parameters must be altered to get the optimum performance out of a downpipe. Most of the performance gains from a downpipe, catless or not, comes from a tune. Sure you can run it without, but it’s not recommended. Plus, you’ll just always have a CEL.
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