The First 15 Minutes of Spy Hunter (Gamecube)

Copied from MobyGames:

Evil multinational corporation, NOSTRA are ready to destroy the world and keep what's left, but as the Spy Hunter, it is the player's job to take them down, using all of the available weapons.

In this remake of the 1980's arcade game, the player must ride through seven real life locations in a G-6155 Interceptor, the most high tech car ever built. Weapons include built in machine guns, oil slicks, missiles and much more.

Two major things happen to the Interceptor: When it hits the water, it transforms into a speed boat. When shields dip lower then 50%, it transforms into a motorcycle or jet ski.