Was eying up one of these up the other day.  As looking to do exhaust thought would make sense to stick a drop in filter in. 

 

Or any alternatives

 

http://www.awesomegti.com/brand/volkswagen-racing/volkswagen-racing-high-flow-replacement-filter-skoda-fabia-vrs-5j

Edited 16 September, 201411 yr by Ant FR

I think there will be minimal gains here over a clean OEM filter.

 

Either Ap or vRS Powered put in a Revo one of these (same thing in effect) and saw zero gains.

 

Should get plenty from doing the downpipe though, especially with a map

Had been using a VWR air filter for a bit over 12 months until very recently. The difference in performance is very small. In the end I found more performance by modifying the air intake by making a second hole alongside the mouth of the intake tube. A proper CAI will more a noticeable difference.