This happened when I was shopping around for my 1er..
Called a dealer: (they had a 2008 135)
Salesman: this is a real beauty, it does run it flies, and last year of turbos too...
Me: Not really, TT were 08-10, twin-scrolls 11+...so they're still turbos.
Salesman: You're wrong, and if you're right my name is not Joe Schmoe and I'll give you $1k discount.
Me: Deal, I'll pick it up tomorrow.
Salesman: I'll double check on that because my son told me...
LoL
So few people know what these cars are all about!
Ended up picking up a 2010 getting lots of looks everything! And since it's almost blacked out completely looks pretty aggressive too.