CDA second filter???

[Manaz]

Be thankful we don't drive a Focus - the ECU is in the airbox on those, and if it loses the cooling from the airbox, it can play up...

[83_SUS]

Autobarn about $550 without the breather filter

is it worth the money if so may look into one or are there better options

[McDub]

is it worth the money if so may look into one or are there better options

best value for money option by far is to keep the stock air box, remove the factory snorkel and replace it with 3 inch piping just like this kit.

here's the cheapest i've found it:
BMC CDA Carbon Dynamic Airbox - Induction Kit CDA85-150 - eBay Air Filters Induction Kits, Performance Tuning Parts, Car Tuning Styling, Vehicle Parts Accessories. (end time 28-Jun-10 10:10:40 AEST)
edit: ebay url's don't work on this site for some reason, search "350360196819" on ebay
GBP205 shipped so about AU$360, although it comes with the 70mm reducer not the 80mm one which we need.
i've emailed them to ask if they can supply the 80mm instead