High Speed stabililty requires a suspension that gets compliant at speed...You want a stiff chassis with proper aero designed to hold the car down over the front and allow the air to escape the out the rear in a "TearDrop" pattern...Canards help hold the front down, a low profile wing the extends the chassis helps stabilize the rear, and run some quality tires at proper pressures...

If you can eliminate drag, your car will be more stable at speed and you will be able to go faster...If you can't eliminate anymore drag, then power is the only thing that will get you going faster...

Zee