Got my 135i M-Sport a week ago and on my way home from work during the middle of the week, a B5 RS4 (sounded like he had an aftermarket exhaust and maybe other mods) pulled up next to me at the stoplight. He revved and I couldn't stop myself.
We both floored it when the light hit green. He was only half a car ahead up till 60, past that he started pulling away. At 80, he was almost 2 car lengths ahead. I am glad I lost because a cop was right around the corner and since the RS4 was ahead of me, he went after him.
We were doing 80 on a 55. All in all, 135i is a tiny beast and i love my 1er!