I got the Stratos' too. The rally one looks great, but is a bit tail happy. I then experimented with the street version. The first time, I turned a stage III NA MR2 into an orange Stratos (looks pretty yellow to me). It was cool, but HP was under 300--not quite enough. Then I used a Supra with a stage IV turbo and race intercooler. The resulting Red Stratos was a 608 HP beast (822 kg by the way), but that was too much. Finally, I made a green one (best color for this model in my opinion) using another MR2, but with only a stage 3 turbo and race intercooler. That's more like it -- I want to say it has about 500. It still out-performs all the JGTC's. The thing is a rocket out of the corners.
A couple notes. I also made the Porsche GT3 (911/996). I remember seeing a burgundy one in a screenshot, but the only color code I have is for yellow. Anyway, the car is ok, but undergeared and with no way to buy a race transmission or any other mods, its pretty much useless for racing.
IMPORTANT. Make sure you got what you want before you save your game. The Diablo ($950,000 I think) can be bought/sold/traded, but neither the Porsche nor the Lancias can be gotten rid of. The only way to remove it from your garage is to save another game over it.
