I use the Mercedes CLK touring car generally, but I honestly don't recall the tune, if any, but I certainly didn't use super hard tires. Nor do I generally use stage 4 turbos.
Some day I might dig out my PS2 and have a look.
I've won the series driving A-spec with all the eligible cars. A bit of a challenge with the Mercedes 190 E, but not too difficult with the others.
I think its a loss for me.. My Opel suck **** at racing B-spec.. I dunno if it was the turbo that I apply, the rigidity, the engine upgrades or anything..