>>6404903No, Kouji and the rest is dubbed by Jesús Barrero. Goku and Bruce Willis is Mario Castañeda, he even voiced Goku for the latin dub of Dragon Ball Evolution by fan demand (Piccolo also got the same voice from the latin dub of DBZ), that managed to make the dubbed movie slightly enjoyable.
Jesús Barrero was Yamcha's voice in Dragon Ball tough. He also did like three characters in Gundam Wing, including Dekim Barton.