The sounds are a hit and miss. Some muscle cars sound absolutely brutal when you apply full throttle at low RPMs, but some cars just sound like weed wackers.
There seems to be an inconsistent level of attention with the cars in this game. Some are spot on; others are completely off.
E92 335i: Space Grey|Coral Red|Aluminum Trim
Hold out for the BRZ STI or... Rocket Bunny FRS. Update: Scratch that. I've got a 2015 5.0/6MT with my name on it.