I still remember a couple of summers ago, I was stuck in traffic in the Stanley Park causeway, due to an accident on the Lions Gate.
 
Bored out of my mind, I notice the fairly stock looking Miata beside me sounds odd... I turn my music off, and wait until trafiic moves a bit.  Yup, monster Miata.  Very stock looking, only give away was the sound (duh lol) and the dual exhaust out the back.   
Old dude was driving, and when he caught me looking, I gave him a thumbs up, and he gave a smile and a nod.  I got the impression he liked having a sleeper of a car, where only car people knew what he really had 
 
 
I think it would be a blast to do.