Freak in my experiance was gash not worth the money.
Had no complaints about the pipe kit I've used this season, regardless if I've used the 'correct' size or an oversized aside from it being slightly louder then the ultralight I used previously.
Empire system all the way. Never had a problem with it. And now the backs and fronts are available individually. It's so good, I chucked my freak in the skip.
After using UL at the start of the year, then a freak, then onto a Pipe and now back to UL, I'd have to say by far the Pipe is much better, planning on buying another pipe kit or swapping my current backs for cocker threads