This series is yet another one that ticked me off - not because it was difficult, but because the prize award is YET AGAIN the stupidest possible choice that PD could have made.
You effectively have to build your own Clio racecar to compete against the actual Clio racecars, just so you can win (wait for it)... a Clio racecar.
I used a white (I think, or maybe blue) Renault Clio Sport, tuned to 302hp, on R3 tires, for 29 A-spec points. My buildout was as follows:
Wing, LW3, race suspension, full customize trans, 3x clutch, race brakes, race intake/exhaust, chip, and NA1. I also put a snappy set of red wheels on it to make it look somewhat like a racecar. My MOVs were anything from 1.2xx" to 4.9xx".