I have the BMC CDA fitter to my 05
MC!
It's a superb bit of kit. BMC says it gives 13bhp - I can't see it being that high myself, but I did see the dyno charts when I went to see them and bought one.
Throttle response is defonately improved from take-off, and when it hits 4k is just sucks in air like it's going out of fashion!
The sound is louder than a Viper and you save a fair few quid!!
The only downside is it's a little tricky to position it. See my pics for the install as recommeded by BMC. Although I have now replaced the throttle body pipe with a silicone connector.
I think 'pholcus' installed his slightly differently using some type of drain pipe bend section if I remember.
All in all a top induction kit for the money! Probably best bang for buck!