pipercross wont really add power, just a bit of noise so i've been told anyway. ITG panel filter and maybe sort the cold air feed out and thats the best bet, unless you have silly money and go for a maxogen.
most people who buy blueflames want to sell them! get a Milltek, i have one and really like it. Or spend more and go for Yozzasport, BTB (shed motorsport), or if your loaded orbisound.
oh and i'm in ports quite alot if you wanted to see the Milltek before you buy...? or come to the meet sunday..!