3 chambers pipes are more develloped than the 2 chamber due the rules in some parts of the world. Beside that, 3 chamber can give an extra resonation which can result in a wider powerband.
There are 2 types of 3 chamber pipes, the EFRA 2000 series which have some holes between the 1st and 3rd chamber and the 3000 series does not have these holes. The 3000 series are more difficult to adjust and do show a powerloss in some area of the revs.
Speed is only fiction but a 130+km/h MRS4 is for real.