High Octane

S5 E7: When a man is decapitated while doing a daring stunt with his car, the team suspects that it was more than just an accident. During evidence collection, the CSIs enter the world of "sideshows," where kids gather in tricked-out cars, mostly stolen, performing dangerous stunts. However, when Horatio discovers that the victim's car's hydraulics where tampered with, he detects that the accident may be been staged as a diversion to a more serious, yet lucrative, crime.