What is the fastest car in burnout paradise

The Krieger Racing WTR is probably the fastest, but with a full boost the Annihilator Street Rod could beat it.
The P12 88 Special boosting in hover mode is devastatingly fast, and with unlimited boost the Extreme Hot Rod could be a contender.
I haven't tried a drag race with all 4 so you'll have to try each one and see which you prefer.
Personally if I'm racing, I'll use the P12 88 Special, partially due to it's speed, but mainly because it looks fantastic hovering with flaming tyre tracks.

Hope that helped!