If you have'nt already got the K&N then have a look at this, It might save you some money and your MAF http://www.seatcupra.net/forums/showthread.php?t=198039&highlight=airbox+smoothing+guide
Yea it makes a chirping noise, some like it I didn't, I get quite an audible noise changing gear at about 3000rpm after that between the exhaust and cone filter I can't actually hear anything. I would like to hear of a way of improving noise to a slightly more audible sound. Relocation kit maybe...
It's a shame VAG engines don't like atmos valves really. I don't want to chuck a Split-R on and risk getting limp mode so the 007 is really the only option, especially after a remap, the Bosch one will crack I would imagine.
the standard one should be ok. early leons had some problems with the diaphrams tearing/holeing but newer ones should be fine. i heard of one tuner using the standard valves for big turbo set ups without issue.
however...the diaphrams could leak robbing power and it wouldnt always be obvious to the cause. 007p has less to go wrong.
their is a beefed up diaphram valve which im using, the apr r1 which sounds good on mine but i dont know what it would sound like under less power.
meet up at pease pottage one night and try it on yours if you like