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I used K&N kits on both of mine, first off the 57i which mine was the donor car for then a Typhoon kit on ST170 #2. Dunno how much they cost these days, thought the Typhoon was a nice piece of kit.
 

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I'd look at the k&n gen 2 and the pipercross viper mate.

The one in the link is cheap for a reason and probably suck in hot air.
 

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FocusSTOC Nut!
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I had a ramair on my crx many moons ago & it was a good piece of kit. never had any problems with it mate!
 
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