Re: BMC CDA - Worth it?
With Nelly, GSR intake pipe and use his (pete the german fellow) air filter.
His pipe is not cheap as its made by hand in the UK from silicone - which is quite a process, but its straight, ultra smooth and has no turbulance so the turbo will spool up loads quicker and will boost a little harder to higher revs.
No bones over the air filter being a cheap import, but he has tested them (on rolling road) and proved that they flow much better than BMC, K&N, ramair etc...etc.
So it may be little more (£££'s) to get a well sorted intake pipe and better flowing filter than the BCA thingy and actually get a decent increase in performance rather than just a whole load of noise.