I went for the bluflame over the miltek because at the time miltek seemed to be having loads of downpipe failures. The blueflame has a real nice noise, with no droan at steady rpms eg motorway ect, which is perfect ! Everybody seems to be commenting on how loud it is, but if I'm honest I'd turn it up a notch if I could.
If you want the swoosh noise with out loosing power like from a dump valve get yourself an itg intake, they make great power and when pressing off you get a high pitch sucking noise, on lift off as the air is forced back through the intake it makes a loud kutchoooo noise, it's feckin brill, defo one of my fav mods !