Are straight pipes illegal

Answer 1

yes they are because a few years ago there was a plot to blow up the president by terrorists planting bombs in the pipes in the president's limo the next time it was taken to be repaired. but they found out about it and since straight pipes are illegal because bombs can't curve they are only straight

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The above is not correct. Straight pipes are illegal (in the U.S., at least), but they are illegal because of the loud noise they produce and because vehicles with straight pipes usually do not meet emissions standards.