Viper ACR best modern touring car?

So im still fairly new to Forza but i just bought the Viper ACR for the modern touring car league and it is a beast! the handling is so clean and crisp and the brakes are unbelievable. The only drawback it seems to have is its not that great in a straight line. Ive been crushing the other cars in the league and im just wondering if this is the best modern touring car in the game. Is it over powered? or does it just fit my drive style really well?

What do you think is the best modern touring car?