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  1. ecu tunning for catless downpipe

    Fiesta ST Electronics
    Has anyone ran a catless downpipe yet? I'm planning on ordering a catless downpipe from milltek, but cobb's stage two and three map require either stock or a high flow cat. I am aware of e-tunes, but hear mixed things about them. :confused::confused::confused: As of right now, I am running the...
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