The Mach 5

After Rex racer appeared to have died tragically, Pops and Sparky rebuilt the Mach 5 from scratch ...this time including the safety 7.

Racer X's vehicle reminds me of the Bat mobile.

Jettison's vehicle is Stinger.

The Terminizer driven by Spike Hessler lacked cornering ability, which was a weakness that resulted in defeat.