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Dirt bike instead of Cayenne
In the mission Train Chase when you're supposed to run to the left to get to the Cayenne there is another path to the right which leads to something that looks like a garage with a roof. In it is an enemy dirt bike whch they use throughtout the level by the enemies to attack you. Go up to it and press Y to get on. The only weapons are missles. The rest of the level is the same as if played with the Cayenne.