Some on here have gone even to a BIG turbo/BIG power, and have not changed out the cold side pipe, and claimed/proven that it did not hurt them one iota.
But, if/when I go even to a hybrid, I will probably change out the cold side pipe (I plan to do the hot side when I install my cp-e IC, with a cp-e hot side pipe, and Mountune/Samco hoses, and TurboSmart Constant tension clamps).