Speaking of opening cans of worms an all....
I fitted a TRD panel filter and didn't notice any difference, I heard the stock intake was good for 500bhp+ I'm with the chief on the hot air
If you haven't already bought one, skip the filter upgrade and go for the TRL FCD, they're about the same price as the filter and allow you to raise your boost above the fuel cut. One of the guys on here will know someone who can fit it for you, C.W did mine with a bleed valve conversion and we raised the boost to about 1.15 bar. The final result was excellent, and to be honest, it is probably in the same region price wise as buying a brand new Apexi induction kit/hoses and having that fitted. You need to decat first or your exhaust temperatures will rocket running higher boost.
Good luck