Re: Poo Poo Pipe??
I use one and don't think there's any loss of power- and they are considerably quieter- the muffler section on mine is half again the length of the standard kit pipe,
It's sorta really an expansion pipe in that sense.
it does add a little bit of weight, which is not good in a second floor apartment.
I had to cut and extend mine- the ones that are supposed to go on top of the bottom bracket are difficult to fit.