The thing is with the totally enclosed systems like the BMC, Pipercross Viper and K&N Apllo is that on a rolling road there is no forced air entering the induction system as the car isnt moving, fans help but not to the extent of forward motion - I reckon this has alot to do with the dyno figures as becuase its totally enclosed there is no other air to induct.
Also I strongly believe alot of people dont find the best place to setup their direct cold air feed again leading to poor results.
It may not look nice but the best place for the cold air feed on such a filter is as close to atmosphere as possible with somepeople choocing to install the pipe to the front bumper with the entery hole on show.
Like I have stated many times before, All induction kits no matter how much you pay for them are only as good as the supply of cold air.
Install the kit, setup as good and most direct acess to cool atmosphere then tell people what you think of the kit.