My favourite for this one which easily wins the races is the Vauxhall Calibra Super Touring Car 1994...it's a monster for it's PP level and is 4WD which is great. If I remember rightly, I added a Stage 3 Turbo on it for high speed tracks but it will still win comfortably without
Pretty much any of the touring cars will work fine in it. I generally use something a bit weaker around 500PP non race car, makes for a more interesting race.
I have also used the RX7 LM RC and the S2000 LM RC, both stock and both an easy win