The Sunburst Grand Turbo Sport is built to push the limits of a production chassis. It features a 5.2L V10 and race suspension. Can hit 200 MPH, but doesn't slack in the corners. And if 900 BHP isn't enough, there's always the NOS.
If you don't already have it installed, you must download this mod to access the V10 : (https://www.beamng.com/resources/high-power-car-pack.56/)