I cant answer your first question, but Im sure someone will be able to.
The SMG box is known to be quite weak, and prone to breaking. I have heard on average they last 75k km, or something silly like that, but, I dont know for sure.
it looks like i will be extending my motorplan as soon as it ends lol, still got a year and a half. thats why i wanna do software and keep my warranty as people say it is untraceable.
a 335i with software alone wont touch a M5, even more so an M6.
Stock E60 M5's at Tarlton run 12.8's @ 182
Dont see a stock 335i running those times. Now if its had more work done to it then yes, it will be closer. But once that M5 gets into 4th and stretches its legs its all over for the x35i
my bro with a 135i with software and octane only just about beat a m5 on the quartermile, track was a bit wet, similar disad for both cars
after the quartermile, no doubt bye bye