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Don't bother. If you want to do anything, i'd get a standard replacement filter, like K&N or Green etc.
Upto you mind, lot of money for nothing IMO.
But if you want noise, dill holes in your standard filter housing
For a performance gain, zero point. But if you want it to sound nice go for it! they do sound suprisingly nice on the 1.2's. I got the square adaptor plate if you want it £20 or £45 including pipercross filter cone. PM if interested.