Omega

The Omega is a yellow sports car with a large, rumbling v8 engine in the back. It is unlocked by collecting all the parts and blueprint for it in Paradise City. It's civilian counterpart is blue and is called "Spirit"

Inspiration
The Omega is based off of a Lotus Espirit V8

Usefullness
It is very fast, and it usefull for racing and side activities, not useful for storyline missions or combat intense situations.