Road cars that work on a racetrack are rare. Here are five models that are brilliant on-road and with few minor tweaks can work in the pressure-cooker racetrack environment. All are priced less than $30K.
1. Renault Sport Clio 172 (Phase 1/2)

2. Mazda MX-5 (NA/NB)

3. Mitsubishi Lancer Evo (V – VIII)

4. Renault Sport Megane 250 Cup

5. Lotus Elise
