Silver F355 Berlinetta spotted 60E

I saw a silver F355 going down the 60E (by the 605) on Wednesday (11/2) around 11:30pm-12:00am. I had a little encounter with the owner and just wanted to know if his F355 was completely stock. It might of been a Spyder, and if it was, the top was not open. I'm guessing if it was a Spyder, it was probably a bit heavier than a Coupe. I know they make 380hp/275lbs. and weigh slightly more than Modenas. Can someone tell me the exact curb weight on both the F355 Coupes & Spyders? Anyone on here? I was driving the black S2000.