hi, wish to check if there is any doblo owners managed to
changed to bmc's cda which also highly recommended by angel tuning

http://www.bmcairfilter.com/infoCDA.asp

http://www.angeltuning.co.uk/bmc.asp

I've not known anyone to use that kit here on the forum but it certainly looks like a good piece of kit. Your best option is to contact Angel Tuning themselfs as they have a Doblo and should be able to advise you on what benifits you'll gain