"One time I called him rich when he showed up in a BMW, and he was like, 'No dude, this is my friends' car, ' " he said.

WSJ: Heritage Linked Boston Suspect, Students

Ahmad Nassri, 20, who played indoor soccer with Mr. Tsarnaev, said Mr. Tsarnaev owned a messy Honda Civic, but occasionally he would borrow the black BMW. "One time I called him rich when he showed up in a BMW, and he was like, 'No dude, this is my friends' car, ' " Mr. Nassri said.

WSJ: Boston Suspects Inspired by Muslim Cleric

"At 208 mph, you have no friends--but me, " Greco laughed, as I climbed from the car.

FORBES: One Lamborghini, One Man, 200 MPH