|Part of||Custom Series Championship|
|Goal||Place 1st in the Grand Prix|
It is the 7th and last event in the Custom Series Championship, and is the final Grand Prix. It contains the highest amount of races out of all Grand Prix, with a total of 7 races. Whilst some of the courses are not difficult themselves, it is the CPU that will be your biggest threat.
The opponents in this Grand Prix are the Custom Roadster, the Custom Muscle and the Supercar, all three being very hard to catch up with, with the Supercar being the fastest car in the game. If one of these vehicles is selected, the Japanese Muscle will be added, only adding to the threat level of the Grand Prix.
This Grand Prix is notable for being one of two Custom Series Grand Prix to include cars outside of the custom series. In this case, the Japanese Muscle and the Supercar appear as opponents, both of which are not classified as custom vehicles. The only other Grand Prix to include such an occurrence is the Point of Impact Grand Prix, which the Japanese Muscle returns from.
This event is comprised of 7 races.
|Big Surf Shores (R)|
|Palm Bay Heights (R)|
|88 Interchange (R)|
|Sunrise Valley Springs (R)|
|Crystal Summit Lake (R)|
|Airport Terminal 3 (R)|
- If you can manage to emerge victorious in this Grand Prix, you will unlock the final trophy, and then the credits will roll. If you get all Gold Medals in this event, as well as all other events, then you will also unlock the Infinite Boost Cheat.