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Either of the carbon airboxes will give similar results mate, but "bodging" one to fit aint the best idea, so either a Viper of CDA is the one to go for...
I have a Viper on mine and there is a definate performance increase with it fitted, and theres definatley more power & torque in the mida range, as we proved on the rollers last year.
However, the CDA is now a lot cheaper (£160 I believe) and just as good (some say better), so if I were you Id get a BMC CDA!
Believe new vipers (evolution) are actually metal with carbon look to them rather than carbon like the CDA. Not seen in fleash though so could be wrong.
CDA is cheaper so I would go with that. As long as its sealed and is heat resistant, and teh filter element is of good quality, cant go wrong with any of them.
I dont know anything about the Maxogen. Viper seems OK but looks a bit airy fairy. CDA I used to use on my valver and it was without a doubt the only filter I ever used that i really rated.
yes there is a gap between the CDA and the viper becuase IMHO (and from tests ive seen) the viper falls quite some distance behind the CDA in terms of performance