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i currently have a F20 and went to mcwell a month ago to have my grill changed. i got recommended to change to the K&N filter and to piggyback my car with the ecutech tuning box. some bros here say its better to keep it stock. i would like to get some valuable feedback on such a tuning box as...

hi there everyone, recently got a brand new F20 116i. definitely going to do slight aesthetics changes. hope to learn from the seniors around here!