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you friend is only correct if they don't believe in science and math, if a free flowing exhaust was really all that great then why don't gas engines run right without any exhaust, a properly sized pipe will HELP to draw out the exhaust gasses from the engine, allowing it to work less and use less gas, a larger pipe requires more flow for this to work properly, so to larger of an exhaust pipe will create that back presure you spoke of and make the engine work harder.
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