I just mentioned the exhaust note in another post, we picked up my Wife's 135is up today and it is LOUD!!! It resonates through the Cabin, Fantastic!!
The loud exhaust and stiff ride really adds to the character of the Car. I'd never driven the Car before we drove it off the Dealer's Lot and was actually shocked, but pleasantly surprized at how loud it is.
It's a very, very quick little Car too...