Looking at air filters for my ZT. Obviously the best option is a 60mm alloy outlet cone air filter to join straight onto the original turbo piping.

Just wondering what people are using? my options are pipercross, K&N, RamAir, ITG. At the moment i'm leaning towards the RamAir as it has a nice black finish option.
However, I've always been a bit cautious of Foam air filters as I've always wondered what happens if the foam breaks down? So has anyone had this happen? and what are you using?