Still interested. Turbo upgrades should be allowed in my opinion. I think some cars should be allowed full upgrades and some not. You might want to consider trying to equalize power. Perhaps, you could post a list with each cars maximum hp. When I run with my friends. I allow the Mazda 787 full upgrades, but some of the cars none or just the stage two upgrade.The Mazda 787 gives away too much horsepower to the other cars. That car, in real life, won because of the fuel consumption regs of Group C. It qualified 12 fastest that year at LeMans; not exactly a rocket on the track. I'm not using that car, but still think we should "balance' the cars somewhat. If you like I can Post what I came up with, in so far,as "balance"