I have friends with new modded 1, 3, and 5 series. None of them are even close to 10. I call BS. You haven't got an 11 sec slip.
Stock, your car is a mid 13 sec car - with the common reflash, you can get in the 12's but it takes suspension and tires to do much more.
I'm not knocking the 335i, it just isn't as fast as a 135 M-series, and I know that isn't close to 11s with a reflash.