Intake is a waste really - you wont see any improvement. You would be better off spending the money on a health check (£40) which will probably reveal a dodgy MAF, diverter valves & possibly a boost leak. All fixed for a couple hundred quid improving performance, economy and sparing the turbos a hard life & potential failure.
If you do choose an intake kit ensure it is not an oil based filter as this will further shorten the life of the MAF sensor.
Cheers,