On all threads bout air filters I c everyone saying knn or green panel filters are pipercross any good? Or do u need cotton gauze type ones?

Pipercross are perfectly acceptable. Try to avoid oiled filters.

Sound thort I'd ask question was considering full induction kit but read a lot that std airbox better till u run high power

Cone vs panel are always heated debates.

Tbh honest always found cone overpriced for wat u get I no on my rs megane the cone was better option due to airbox been restrictive as f**k but yh gathered it's a heated debate lol

And if I was to go down cone route are mishimoto any good first jap car I've owned so not heard of them

Mishimoto are a good company and well respected but I couldn't comment on any cone filters.

Ok I no they do hoses but noticed they do induction kit for 08+ I'll c how I feel probably stick wi my airbox n panel cheers tho

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Got a panel pipe cross in the blobeye and K&N Apollo in the bugeye not seen any differance at all to be honest, lol [emoji1]

I think it's just something people on forums like to fall out about. [emoji6] but the panel filters are well designed so no real reason to change it unless you want too.

Yh think I'll leave it on my old rs megane used to get bov noise from filter wi out bov n got annoying but if I understand correctly the impreza won't be like that wi a cone

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I use a panel filter and decat down pipe. I get turbo whistle. Only -0.2 up to 0 bar.

At min I got panel n both cats gone n turbo definitely whistles lol just don't want that silly dump valve noise I used to get from cone in rs megane

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Shouldn't get that unless you actually fit a VTA dump Vale.

Sound need to get my recirc uprated be a better investment than cone I'm thinking

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On an 08+ WRX there will be very little difference, aside from price, from an induction kit vs decent filter. I ran K&N on mine (About £35 if memory serves). I have an AEM induction kit on my STi now and it has probably gained me around 5 of the 340 horses.