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Why do you think 2.5 inch and 3" exhausts exist? 3 inch is for turbo, as it's more free flowing. With a NA engine, you should have back pressure which is why you use a smaller 2.5 inch exhaust. You CAN put a 3 inch exhaust on your KA, but it will have negative side effects.. if your doing it just for looks.. or sound, sounds pretty rice to me. Get a 2.5 inch exhaust and call it a day.
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